There are subjectives, and then there are these. While you may believe a work fits here, and you might be right, people tend to have rather vocal, differing opinions about this subject. Please keep these off of the work's page.
No ASSCAPS, no bold, and no italics unless it's the title of a work. We are not yelling the DMoSs out loud.
Metz77: Peri in general is a dethroning character, but her absolute worst moment is in her debut episode, "Planet of Fire", when Nicola Bryant, struggling to make her American accent sound even slightly convincing, attempts to be defiant at the Master with the line "I'm Perpugilliam Brown and I can shout just as loud as you can." Instead of sounding defiant and confident, it comes out shakier than a bobblehead in an earthquake.
Sceptre: "The Twin Dilemma". Strangling the companion is not the best way to present a new Doctor to the world. It pretty much killed the show for twenty years. And the plot is so bad the novelization is a thousand times better, in a world where the reverse tends to happen.
TylerFG: My sympathy for Nine was completely destroyed when he told the Dalek in its titular episode to go kill itself. Whether the Dalek had it coming or not, you never tell somebody to kill themselves, and I was expecting so much better from somebody as open minded as the Doctor! And he's supposed to be the hero of this show? Even if Rose told him off near the end, that still doesn't excuse his disgusting actions in that episode.
Gentlemens Dame 883: At the risk of earning the ire of Nine fans, I found his chickening out of destroying both the Daleks and Earth in "Parting of the Ways", given his previously established Badassitude in taking Van Statten's gun to use against the Dalek and not flinching from Margaret Blaine's attempted shaming of Team TARDIS in "Boom Town", to be one of these.
Rushi: "The Christmas Invasion". If Harriet Jones is supposed to bring a Golden Age to Britain, I believe that Ten should have let her do it. Or the Reapers should have shown up and screw him and Rose over for messing up the timeline or something.
InTheGallbladder: I think I'll step up to the plate and add "Love And Monsters" to the list. Lazy writing, lots of padding, shoddy humor and a mountain of stupidity all steadily accumulated over the course of the episode, to the point where they were practically unignorable. But the fun doesn't truly begin until the villain is revealed to be a complete ripoff of Fat Bastard, to the point of even having a similar-sounding accent. It's at this point that Ursula is reduced to a disembodied face that protrudes out of things. She's then robbed of her dignity, leading into the reveal that she will spend eternity a talking paving slab. This is considered a happy ending.
Jarxon6: That was all minor, to me at least, compared to the EPIC derailing of both Rose and the Doctor. There's this big monster, threatening to absorb someone, several innocents trapped in an And I Must Scream situation, and the doctor has a more or less instant solution. So, what does the Doctor do? Stands back and watches Rose bitch out the guy for a fairly minor thing, thus making it impossible to free the people trapped. Let me repeat this: our heroes condemn innocent people to A Fate Worse Than Death so Rose can complain.
WickedIcon: How has nobody mentioned the fucking paving-slab blowjob yet?
Tropers/romanatorX: Almost everything about "Fear Her" was an embarrassment to the series, from the bad acting to the idiot balls. I would nominate the childish aesop about "Love conquers all" to be the episode's nadir, but no. The ultimate low point for the entire franchise is the drawing of Chloe's abusive dad being turned back to life. So how do they defeat him? Chloe and her mother... sing him away. Yes, you heard that right. They sing a living being away. That is so childish that it is actually insulting to the millions of fans who practically begged the BBC to bring back Doctor Who for so many years. And even if it wasn't prodding to the youngest demographic, you could tell that the writers, when coming up for an ending to this episode, threw their hands up in the air and said "We don't give a damn!" Give me the charm (mediocre special effects, So Bad, It's Good acting) of the old series over this childish excuse of a Doctor Who episode any day.
Calamity2007: Also the reveal that the Toclafane are the future of humanity, who in an effort to escape the death of the universe, turned themselves into cyborg creatures, with minds of children, that cannibalize and kill each other for fun. That's right, in one simple reveal, RTD managed to make any optimistic speech about the human race moot, since apparently we are all doomed to become psychopathic man-children no matter what. Just feels like the only reason the plot twist was even included was to just make The Master look more evil for using them.
Larkmarn: As much as I disliked Donna (... which is a lot, by the way) the titular girl in "The Doctor's Daughter". Now, not only do I take issue with introducing an item that can single-handedly allow the Doctor to recreate the Time Lord race (granted he has gone back and forth on whether or not that would be a good thing or not, but it's still worrisome), but then functions as a massive Canon Sue, being birthed fully formed with Time Lord intelligence and Action Girl abilities. But the absolute dethroning moment was the end. Despite being, you know, dead, she regenerated... but for some reason, she kept her body and instantly went on an And the Adventure Continues.
Renita: Doctor Who episode "Journey's End". So, many reasons, including the regeneration tease, the Clone Doctor, the Doctor's reaction to the Clone Doctor's rational decision to kill the Daleks when they were clearly beyond redemption, the Doctor fobbing Rose off with the Clone Doctor, Donna defeating the Daleks with Time Lord leet haxxor skillz, Donna being given a psychic lobotomy, the Earth being towed back whilst that "you should feel moved now" music plays in the background like a cue card and Davros being downgraded from Magnificent Bastard to a Dalek pet just to sate the wrath of the Fan Dumb that objected to him ever overshadowing his creations despite being far more interesting than they are.
Loquacia: The realization of the complete bollocks that the Daleks would keep a "blow us up" button in the first place rather spoiled the episode, let alone that they'd keep it in the same room as their enemies.
cavenglok: Well, it's not really a blow-up button... The Doctor says he's maximizing Dalekanium power feeds, which probably means that the power feeds were meant to be useful, like to provide more energy for their armor or something. Still pretty stupid that they'd keep it in the same room as the Doctor, though...
BlueButterfly: Donna's psychic lobotomy is the one I took issue with. She was the first new series companion not to be in love with the Doctor (Rose, Martha, Jack, Amy), whose life didn't revolve around him, who held her own and underwent a huge deal of Character Development, gained confidence, got significantly less annoying and then saved all of existence with not just sudden Time Lord knowledge but also her own skills...and she will never remember any of it and is reverted back to who she was (which we see in later appearances), because drama. It felt like RTD was slapping me in the face for liking her so much.
Crazyrabbits: The "dramatic" gun scene in "The End Of Time, Pt 2". Was there really any doubt that The Doctor was going to shoot the computer maintaining the link? Not to mention that the other supposed targets in question could both regenerate and shoot lightning bolts from their hands. It even underscores the power of the next scene, where a pissed-off Master unloads all the electricity he has into Rassilon, driving him back into the gateway.
polooglu: Ten saying "I don't want to go". Sure, tons of people think it's sad, but really considering the Doctor has done it nine times prior, and never complained as much, and got to wrap up all his loose ends (something I would be grateful to have done before I died), the fact that he still goes into his regeneration kicking and screaming just leaves a bad taste in my mouth.
Sonikkuruzu: Ten also seemed to be holding on for as long as possible, almost as if he wanted his next self to be born in a crashing TARDIS. Partly sad though mostly selfish.
Hyrin: I wasn't so bothered by Ten saying goodbye as I was by the fact that his regeneration somehow flipped the Self-Destruct Mechanism on the TARDIS. Several Doctors have regenerated inside the TARDIS without sending it out of control towards the nearest inhabited area, and it just felt like a cheap setup for Eleven to be the wacky one who laughs as his flaming ship plows towards some hapless Scottish garden.
FezJez: After going to great lengths to establish in Journey's End and reassert in The End Of Time Part 1 that if Donna remembers her time with the Doctor then "her mind will burn and she will die", Russell T. Davies completely ignores it and instead has her unleash a Master-blasting booby trap and then wake up later perfectly alright with no other explanation than the Doctor's line "Do you really think I'd leave my best friend without a defence mechanism". Lame doesn't even begin to describe it.
LahmacunKebab: "Day of the Moon". Wait, so genetically engineered priests from the future have been secretly controlling humanity since prehistory just because they wanted space suits? Needlessly complicated doesn't even begin to cover it.
nostalgicfan: "The Doctor, the Widow and the Wardrobe". The underlying Christmas message quoted: "Men are weak". I have forgiven almost everything in Doctor Who, but I cannot forgive this episode. The plot holes are just huge and would take an entire page to fill, but I'll take one: The Doctor, a neigh immortal Time Lord, with memories of over ten lifetimes (which, when the Flesh tried to emulate, it was completely overwhelmed by without the Doctor keeping it together), was an unsuitable carrier for the Tree Lights because of his male organs. Fortunately, there was a woman around, so she could fly the tree-ship through the Time Vortex. No kudos was given to the young boy who had led them there (and come on, would any kid 'really' do that if they found a magic portal?). The message was vindicated as much as possible by the plot by having all the male characters act like gung-ho idiots, with only the women being the sensible ones. I just want to forget this episode ever existed, and I genuinely feel sorry for any young boy who watched this one.
James Picard: "Asylum of the Daleks". The entire episode relied on viewers eating up incredibly dumb stuff. The Daleks characterization is completely ignored, the much-hyped "Classic Daleks" only get cameos; the Amy and Rory divorce was stupid, offensive, and to finally twist the knife in the wound, it was filler! It never came up again! Then there was the fact that even Oswin's voice was inconsistent, and really, it was just a horrible episode that needed either major rewrites, or just plain trashing. This was Moffat's lowest point for me.
pulsor93: Slightly subverted by "The Snowmen", which featured Clara Oswin Oswald. So much for it being filler.
Telepresent: The episode wasn't filler, but the whole divorce business certainly was...
Tropers/Dragonmouth: The big reveal of why Amy and Rory are getting a divorce. Amy says she left Rory because she could no longer bear children after her experience at Demons Run and felt she was no longer worthy of him. First of all, Rory never showed any particularly strong interest in raising children. But what really makes this a Dethroning Moment is how horrifically it derailed Amy's character. I can understand why Amy might be angry at the Silence for what they did to her but I cannot see her being ashamed of her inability to have children. She should have had an honest discussion about her infertility with her husband but instead she ran away from him without telling him why, which is irrational and cruel. Amy was a smart, spirited, loving and mature woman, but now she seems to believe that a woman is worthless to her husband if she is unable to bear children.
Kellor: "The Power of Three". As others have summed it up, it's like the writer came up with an interesting idea, wrote himself into a corner, and came up with a nonsense ending just to be done with it. We've got an alien race that the Time Lords apparently believed were just a myth (which seems like a phrase we've heard so much that's its become cliche). They want to stop humanity from colonizing space. This is a cool motivation that is just wasted on this episode- there's no sympathetic or even relatable face put on the Shakri, they're just another race of jerks. We don't even meet a real one, just a soapboxing hologram. They're advanced enough that they can time travel, build indestructible and scientifically inscrutable devices, and can hide in parallel dimensions. Yet the best plan they could come up with took a year to execute and only killed a third of humanity. Only the aliens from Plan 9 were less competent. Had the cubes used biological, chemical, or even conventional weapons, Earth would have been screwed. One of the cubes sprouted a gun and flew around shooting- why didn't they all do that? And why did they need to study humanity for 47 minutes if they came from a future that was overrun by humans? Why did one of the cubes play the Chicken Dance? Why was the robot girl with the weird eyes sitting in that hospital all year? Why were the aliens (androids?) with the weird mouths kidnapping people from the hospital? Nothing made sense. Added to that, we've got Brian sitting in the Tardis watching a cube for two days straight without moving or anyone noticing (remember when Mickey was justifiably miffed about holding a lever in the Tardis for an hour?), we've got the Doctor being a real pain in the ass about sitting still for a few minutes, and we've got all of humanity bringing unknown alien things into their homes and businesses because humanity is just quirky like that. This didn't have characters playing with an Idiot Ball, it had everyone playing in an Idiot Ball pit.
Valjean: The main redeeming factor to this plot was that no one really cared about its stupidity because it was pretty much a minor Excuse Plot for the Doctor to hang around on Earth with Amy and Rory, and the character-driven real plot of the episode was Amy and Rory adjusting to and settling into their non-world-saving normal routine of daily life and responsibility (because they did it while saving the world, but saving the world from a slow invasion that was taking months to get underway — it crept up on them very naturally), realizing that they love the Doctor but can live without him, the Doctor being regular friends with Amy and Rory and slowly letting them go, and it all seemed to be moving towards a logical ending of them having one last crazy adventure before amicably retiring from companioning for good in a satisfying and optimistic manner. Then we got "The Angels Take Manhattan" instead. *thud thud thud*
PentiumMMX2: This episode was easily my least favorite of the revived series, entirely because the main plot felt like a waste. To me, it actually had good build-up, and given how there was maybe 5 minutes left on the episode when the villain revealed what their plan was, I expected it to be a two-part episode. But, they resolve the plot by having the Doctor use the sonic screwdriver on one of the control panels for the alien ship, causing it to self-destruct and somehow resurrect everyone who died as a result of the cubes. I was very much annoyed by this; it felt like they wanted to make this a two-part episode, but were unable to, so they just hastily cobbled together an ending.
Dark Hero 9: "The Angels Take Manhattan", just all of it. But if you want a more specific reason for why this episode is the lowest point in the Moffat era, we'll begin with the ridiculousness of the plot that relies on a paradox that makes absolutely no sense after you think about it. A new rule that comes right out of nowhere that subverts the "Time can be rewritten" message that had existed throughout. Not only that, but Amy and Rory's departure is the worst companion departure ever on this show, simply because of how mean-spirited it is, as well as rendering the bulk of the plot of the episode completely pointless. It's the worst case of The Bad Guy Wins that I have ever seen in any media. Especially since, in all honesty, their stories ended just fine in Series 6; there was absolutely no reason to do this episode other than because Moffat apparently disagreed. Not only that, but it doesn't match the tone of the rest of Series 7, especially where Amy and Rory's story was going. This episode sucks and deserves to be forgotten, it's such an absolute waste of two awesome characters in the worst way imaginable.
Dynamite XI: This. The Amy arc should have ended with Amy accepting that she doesn't need to wait anymore, telling the Doctor that he can move on, but the episode forces the decision on her and only serves to give the Doctor angst. Plus, Moff seems to be sticking to the dogma of "fixed points in time," even though the Doctor actually HAS looked ahead to a Bad Future and still managed to change it (at least twice, anyway). It's like the showrunners are trying to one-up each other with tragic ways to permanently dismiss companions. Except this time it felt exactly like when Peri was killed off in the classic series, yet got some kind of tacked-on Esoteric Happy Ending. Anyway, this episode certainly killed Season 7's good vibes.
Highwind - "The Power of Three" would have been a superior ending to Amy and Rory, especially since the whole episode was about them finally settling down in a post-Doctor life. They could have simply said "No, you go on your own" to The Doctor, Doc could have been sad for a while, and then gotten the new companion. Instead, we get this abomination, which butchers Angel rules again (Angels are clearly moving and existing while being looked at, or with camera focus on them. The fact they didn't move even when you were looking at them was part of the creepiness), has several paradoxes, and as others have mentioned goes against Amy and Rory's plot arc as a whole.
Sedirex: And seriously, the Statue of goddamned Liberty? You really expect us to believe no one in all of Manhattan looked at it in the entire time it was taking a stroll?
SbenLives: "The Rings of Akhaten" contained a lot of stupid decisions, like the dreadful singing element, but this Troper's breaking point was how the planet-eating planet creature was destroyed. Seriously, that single leaf (one that led, somehow, to Clara being born) contained more stories for the thing to feed on than what the Doctor himself offered up?! One could argue the issue with what Clara ended up doing in "The Name of the Doctor," but it still grated. That whole resolution reeked of Clara becoming Moffat's Creator's Pet.
MrThorfan64: I was doing "Journey To The Center Of The Tardis" and hope someone will put it back but I am now going to add "Tooth and Claw". The behaviour of Rose, the "perfect companion". People are getting torn to pieces by a werewolf. And what does Rose do? She keeps trying to win a stupid bet with the Doctor that she can get Victoria to say she isn't amused. What. This isn't the time Rose! Her and 10 come across as unbearable here, seeming to enjoy the horrible stuff that's going on. It's not surprising Victoria banishes, from her perspective, these terrible people. Rose and 10 is thought by many as the best TARDIS team but this episode demonstrates what jerks they are.
Novus Wulf: "Nightmare in Silver". The episode shows signs of running out of ideas when the whole Imperium is unashamedly ripped straight from Warhammer 40,000 - "Punisment Platoon" being a nice rewording of Penal Squad, the soldiers clearly dressed like classic Cadians and armed with Lasguns, and they even have a goddamned Emperor (who mercifully is NOT a corpse on a Golden Throne, thank god)! However, where I really take umbridge with this episode is what it did to the Cybermen. It's something Moffat and team have been doing for a while now - first the Daleks being changed from a Nazi Allegory to "they take love and replace it with hate" or some other BS, but now they've turned the Cybermen into a carbon copy of the Borg! Weren't the Borg Cybermen ripoffs? At any rate, the sheer amount of Plagiarism going on and the absolutely awful re-imaging of the Cybermen makes this episode my new low point. Oh, and those insufferable, terribly acting kids (who were to some credit at least out of the way for most of the running time). Good god, Moffat and friends, was this awful.
fluffything: I'll just flat-out say it. I did not like "The Name Of The Doctor". I felt it was overhyped, had an uninteresting villain (sorry, but The Great Intelligence does not deserve to be among the likes of The Master and/or Davros as an arch-nemesis for The Doctor), and ended on a predictable cliffhanger (Though, I will admit I do like the idea of John Hurt as an alternate Doctor). But, my biggest problem is the reveal of who or what Clara is. How she is able to exist in many different timelines at once. The reveal? It is due to her entering The Doctor's time-stream (IE: his life) in order to save him from the GI causing her life to split into over a million different versions. That's right, the whole thing was one big "Clara is destined to save The Doctor!" reveal. Or, to put it bluntly, they turned Clara into one big Mary Sue. What should've been a huge reveal for The Doctor is turned yet into another "Clara-centered" episode as she once again steals the spotlight. They could've had River, Strax, Jenny, and Vastra all joining Clara as she enters The Doctor's time-stream to save him from the GI in a big epic moment of "Let's save The Doctor". But, nope, instead, we have to have Clara be miss Purity Sue and sacrifice herself to save The Doctor all by herself because otherwise we couldn't reveal that this is how she exists in multiple time streams. What a load of bull. Give me back "Dalek Oswin". At least she was more interesting and compelling of a character than little miss Mary Sue here.
ThatRandomGuy42: I'm not angry over "The Time of the Doctor", but it was rather disappointing in many aspects. The massive war on Trenzalore didn't look like much of a war until near the end, there were one too many things to keep track off (especially with the Time Skip mechanic thrown in) and the solution to the Doctor's regeneration cycle was... too simple. Call me weird for thinking that, but Clara begging the Time Lords to give him a new cycle and having it work seemed a bit too... easy. I was expecting a more complex method from Moffat. It's probably because that I wasn't the biggest fan of Amy but her cameo right at the end did nothing for me other than remind me that she was his companion. Finally, the Doctor's regeneration happening in the blink of an eye felt a little off compared to the spectacular regenerations of the 8th, War, 9th and 10th Doctors. Some things worked in the episode, but it was far from perfect.