Fundamentally, End of Evangelion forms an alternate ending for the series, along with the updated "video & LD versions" of episodes 21 through 24. Fans do exist who would have preferred that NGE ended with its television broadcast of the original ending, some considering the updated ending to be unnecessary retcon that soils interpretation of the show.
...and further ruining things is the game Neon Genesis Evangelions (or NGE 2) for PlayStation 2 and PSP. This was released in two iterations during the Aughts and marketed as containing the answers to the show's most niggling secrets. Much of this material has been translated over the years, and there have been no shortage of appreciative fans — but with that comes a vocal minority crying foul that the game reveals too much and ruins the mystery. (Never mind that with every secret spoiled, many more mysteries have been created.)
If the new Evangelion movies (the fan-branded "Rebuild") end up being connected in-universe to the original Evangelion series, many Eva fans will cry out "RUINED FOREVER" in a singular voice so terrible that it will knock the planet off-axis.
. . . And they may awaken their Evas, creating a literal Third Impact all their own.
At what point was Armored Trooper VOTOMS Ruined Forever for people looking for a hard sci-fi mecha series? Was it Roots of Ambition where Chirico survived a shot in his heart due to Perfect Survivor status? Was it The Shining Heresy where Chirico was Born Lucky enough to do a crazy ricochet fluke shot into the Order Buckler's cockpit and destroying Teitania's Auxillary Brain, Was it the newer OVAs such as Pailsen Files and Phantom Arc for Sunrise copping out on dodgy computer-generated ATs and it basically amounting to needless padding on Chirico's backstory, Some even claim that VOTOMS wasn't very realistic to begin with when the Quent arc rolled around and The Reveal happened. for bonus points, mention the phrase "Child of God." as that aspect of Chirico's character is a sore spot with many fans.
Fyana's sidelining and death in Shining Heresy is another sore point with some fans, along with the fact that the plot apparently had to be cut down and rushed from the original OVA outline.
Ypsilon's backstory in The Last Red Shoulder is debated, with some feeling it ruined his character in portraying him as a naive child-like man who only became driven to kill Chirico due to Killy and the twins' insistence, rather than him being born that way from the start.
Digimon Frontier: What the?! The Digidestined in this series transform into the Digimon?! And there's no real partner dynamic?!
The instant revival of everyone who died during the Invasion of Pain Arc pissed off many fans. Of course, the fans were also pissed when everyone died so now they're thought of as unpleasable.
The announcement that Naruto Shippuden would air on Disney XD has obviously not been taken well in certain parts of its fandom. Despite the fact that Viz Media will still be releasing uncut DVDs, so even if it does turn out to be a Macekre there won't be that much reason to complain. As can be seen with Marvel, just being associated with Disney is prone to bring in the ruins.
Any of Ash's female companions seem to spark these responses in general. Dawn gets hate for not only being another Misty replacement, but for replacing May as well. And then there's Iris, who in turn is hated for replacing Dawn and used as yet another example of the show being ruined.
The dubbing of the show also got this claim after it went in-house, mainly due to the resulting voice actor switch, with the jarring changes made to the voices of characters that fans had become adjusted to. That said, it still fits this trope to a "T". But most of the fans really don't even give a damn anymore, since the new voice actors improved over time (for the most part).
And now for something not related to the voice actors: OMG they changed the "TO BE CONTINUED" text! And the title of the episode was written in English instead of Japanese with English subtitles! So were the credits! The anime is ruined FOREVER!
Some Team Rocket fans claimed the trio was ruined FOREVER!! when Jessie and James were given black uniforms and a serious promotion, along with a new serious-business attitude. In reality, they were made Badass and much more awesome, though the change didn't last for the whole arc.
Several members of the fandom cried 'RUINED FOREVER" after the One Shot character Tobias defeated Ash with a Latios and a Darkrai. In fact, just the very idea of certain Pokemon being used in the Anime has caused fandom uproar.note Usually Legendaries, though Dawn getting a Togekiss roused the ire of Misty fans, even those who hated the original Togepi.
On the other end of the scale, Ash being defeated by Cameron, who's an even bigger Idiot than Ash, is a sore spot in the fandom. The fact that that left the actual champion as The Unfought didn't help.
Having the replacement arc for Team Plasma follow the Tournament Arc? Stuffing all your Filler in the last 5 months of the generation? I'm not too sure about this...
Once it became apparent that the Mewtwo in Pokemon Extreme Speed Genesect Mewtwo Awakens was in fact a new character rather than the original Mewtwo, the fandom declared not only that the movie was ruined, but that everything involving the original Mewtwo was somehow retroactively ruined as well. It's also being touted as the point that the (current) writing staff gave the Periphery Demographicnote read: anyone who started watching when Misty or May were on the team and is still watching an Eyelid Pull Taunt using the middle finger.
To expand on that, parts of the online fandom of any given anime tends to say that any anime that gets dubbed into English (no matter how faithfully), is "ruined", despite the fact that no one's ever going to force them to actually listen to the English audio.
Even though the Ghibli dubs are generally respected, there are some so-called "true fans" who insist on hating them simply because they're by Disney, and they object to any change to the dialogue, music, that may have been done to these films, stating that these movies have all been destroyed; an argument which is totally fatuous considering that Miyazaki and Ghibli were both involved with the creation of the dubs. If they don't think their works are ruined, who are such "fans" to say otherwise?
Made even more ironic considering Miyazaki himself stated that for quite a few of his characters he was forced into a form of "Accent Adaptation" due to the lack of any dialect he felt fit the characters within the Japanese Language. A prime example he named is the Witch of the Waste in Howl's Moving Castle.
Speaking of that one: Disney let the younger siblings of Miley Cyrus and the Jonas Brothers voice-act Ponyo and Sousuke (respectively) in the English dub of Ponyo on a Cliff by the Sea? Cue building nerdrage via Periphery Hatedom by proxy.
And on the flipside, with the anime industry scrambling to salvage itself and still turn a profit while still trying to license a diverse bunch of shows, several "niche" shows are being released sub-only. You know, the kinds of shows that put even a large studio like Geneon out of business because the dub cost so much the show didn't turn a profit. Anime is now ruined FOREVER because the industry is "discriminating" against dub fans. Strangely, nobody thinks the industry is ruined FOREVER because of the ongoing recession.
And now we have confirmation that Saban Brands owns the distribution rights to the series...
It appears to be very common in mainstream mecha anime. Fans have found something to complain about in every single episode for Code Geass, Macross Frontier, and Gundam 00, with the amount of ruin escalating the higher the episode count is. Code Geass R2 in particular has the series FOREVER at least once per episode, according to some Fan Dumbs.
Many Fruits Basket fans cried this when it was revealed that Akito is female, which sunk ships everywhere and created a generally hilarious explosion because we all know that Het Is Ew and they totally ruined the character for ever and ever.
Fans have different opinions on where this happened in Bleach.
When Hitsugaya (presumably) beat Halibel there was a sudden influx of "Bleach is ta lose!!11one!" When it was revealed that he hadn't even scratched her, very few of those who declared the series ruined came forward to retract their previous assessment. Particularly sad considering the lack of genre savviness of these viewers; when has trapping an opponent in ice ever worked? (except in Fairy Tail)
Since the start of the Soul Society arc.
Since the END of the Soul Society arc, and into the filler Bount Arc that seemed to go on forever.
Almost any point after the start of Ichigo vs. Ulquiorra.
Special mention should probably also go to Yammy's Reveal as the 0 Espada, which tended to be viewed as a) wall-bangingly stupid, b) hilarious, c) awesome, or d) some combination of the above.
Many readers following the chapter releases online actually embraced the whole thing and started to enjoy the many inventive ways the author can come up with to "ruin" his manga. The most ridiculous the development, the better! Kubo himself stated that he really loves designing characters and admits to creating new ones as a way to get himself out of writer's block.
This has not been stressed enough. Every time something happens in Bleach, it's ruined forever. Starrk didn't kill a billion Captains? He was pointless. Ulquiorra is popular? He's being milked. People expected more of the Vasto Lordes? Kubo overhyped them. The Fake Karakura Town Arc? Too much fighting, not enough character development. The beginning of the Lost Agent Arc? This is so slow it's worse than filler! Kyoraku didn't reveal his Bankai & that's terrible, but the series should have ended anyway. The point here is that the fanbase is unpleasable.
There was also a case of this during the Deicide in which the "fans" had a problem with, wait for it..., the name; complaining endlessly that Tite is an idiot who couldn't spell the word decide right. Said "fans" tended to ignore the possibility that Deicide could possibly be a word itself and didn't even bother to do a simple Google search to do the research. Like the above example very few retracted their statements. It pains this troper how little common sense and basic dignity is left in the Bleach Fandom nowadays, though granted, of cource, that these are only the vocal minority.
This has perhaps become even more pronounced in the last arc due to such revelations as Masaki Kurosaki being a Quincy, Retsu Unohana being revealed as an unrepentent bloodthirsty psychopath who dies just for the sake of making Kenpachi Zaraki stronger, and the true nature of Zangetsu. Because these developments fundamentally alter perception of the characters, some of the fans who dislike them say that their enjoyment of the earlier parts of the series has been irrevocably tainted. And that's not getting into the ever present debates on whether these developments make sense, could have used a better build up or are just straight up Ass Pulls.
Some people say that L's death did this to Death Note, and that Light's death at the end of the series ruined it even more.
Some sections of the Umineko no Naku Koro ni fanbase tend to think every new and irritating bit in The Anime of the Game (which there is admittedly quite a lot of) has Ruined the series FOREVER. Particularly cutting out all the real-world parts of EP4 after George and Jessica kill each other to give more time to the Meta-World sequences and backstory for a somewhat Creator's Pet-ified Ange.
A second season for the anime Black Butler was announced... featuring an original new protagonist and Butler not from the previous season or manga, and not Ciel and Sebastian. Cue the wailing of thousands of yaoi fangirls around the internet. Which, as it later turned out, was A-1 Pictures just trolling the fandom.
One Piece started getting these accusations once Portgas D. Ace bit the dust, breaking the tradition of not killing named characters, except in flashbacks, that was maintained for 13 years of publication.
Named characters have died, there had just been too many Disney Deaths.
And then, after there was confirmation of a Time Skip happening, it started rising again.
Some people complained about Hancock falling in love with Luffy because it would ruin the series being strictly No Hugging, No Kissing. Thankfully, this was averted.
Parodied in Darker Than Black with Kiko and her otaku friend. After months of giddy anticipation over the next release of their favorite anime, they storm out in anger over how it's Ruined FOREVER, and Kiko will not let the director get away with this!
Turn A Gundam was considered Gundam's embodiment of this trope back around the turn (pardon the expression) of the century. A Gundam series that focuses on character development and slice of life elements as opposed to giant robots fighting each other and people dying in gruesome and unlikely ways!? Say it isn't so!
Depending on who you ask, 00 was either ruined forever in its first season (Full Metal Panic! with Gundams), in its second season (the Zeta Gundam rehash) or in its movie (the bastard child of Char's Counterattack and Star Trek: First Contact). To summarize, 00 was ruined forever because it either 1.) diverted from traditional Gundam storytelling, 2.) reverted to traditional Gundam storytelling or 3.) was invaded by an army of T-1000s. And then there's the crowd who found 00's writing shoddy throughout...
Heck, the entire idea of Marvel Anime (having popular Marvel superheroes in anime style made by Madhouse) may be seen as RUINED FOREVER by many anime and Marvel fans alike, mainly because having popular American superheroes in Japanese anime style is seen not to fit well with each other. Of course, the reception of the Marvel anime idea received mixed reviews from fans and critics alike.
The episode in question was about 90% sexual fanservice and isn't even canon.
Many people complain over the Viz re-releases of Pokémon Special for various reasons, the most legitimate complaint being that there seem to be no plans to release the third gen story arcs until/unless the Ruby/Sapphire remakes come out, leaving out about 15 volumes worth of material out that will inevitably cause massive plot holes and spoilers in the currently on-going Diamond/Pearl arc.
The Ruby/Sapphire chapter is finally released, but the above still applies as it'll never catch up to prevent the spoilers.
It doesn't matter how many years have passed, several fans of Dragon Ball feel the series lost it with the switch to Dragon Ball Z and the more sci-fi and less comedic emphasis, even though in the latter's case the humor was already being toned down a little by the time Piccolo first showed up.
Don't even mention Dragon Ball GT fans. They will instantly bring up the idea that GT was not canon since Akira Toriyama did not involve in the development. Their reasons being Goku became a One-Man Army and Marty Stu, and other major characters in the previous series existed to be kidnapped, brainwashed, turned into punching bags, or even killed off.
The Buu Saga is this for many fans with its overall change in tone from dark storylines to focus more on humor and, to the hardcore Gohan fans, its treatment of him from the main character to supporting role.
Don't ask Medabots fans what they think of Spirits (The second series), there's better ways of committing Suicide by Cop
Quite a few fans called this when Sword Art Online moved onto the ALFheim arc. First off, it killed off what would've been a great (and emotional) conclusion to the series. Then, Asuna became a Damsel in Distress and Adaptation Distillation removed any evidence that Liz, Silica, Agil and Klein were also in the game. They're instead pushed aside for Sugu and her feelings for her "brother" Kazuto/Kirito. When Episode 21 hit, the arrival of Tentacle Rope had the fanbase screaming and Episode 24's Attempted Rape of Asuna in front of Kirito sent most who had stuck with the show until that point nuclear.
FUNimation's dub of Axis Powers Hetalia quickly resulted in this reception. Was it the Rated M for Money changes that made it more like it was trying too hard to be offensive and ape South Park? Was it the fact that the characters were cast with ridiculous accents? Or that Frontier Works mandated that the English translators use "Britain" for the England/UK character? These were a few reasons given, among others, in the huge uproar.
The film of the anime, "Paint it White", earned very negative reactions due to Studio Deen stuffing up the running time with random clips from the anime inserted in between actual plot moments. The DVD version featured a "Skip Play" alternative cut with the clips taken out, although the movie is very short without them.
In Yu-Gi-Oh! 5Ds, many fans assumed for a long time that Big Bad Z-One was actually Yusei, from the future. What happened when his true identity as an imposter was revealed? Pure rage, at least from American fans. "Sacrilege! Ruined forever!" (Of course, the thing is, no character on the show or any of the show's writers had ever actually made the claim even once up to then that he was Yusei. Fans had just assumed, like the case with Bruno, that it was an badly-kept secret that was intentionally badly kept.) What the Fan Dumb fans might as well have said was, "We don't care how often writers do it, how dare you lead us on with a red herring and then give us an ending that surprised us?" and "Why should the series have a happy ending where the status quo is preserved and the hero remains heroic?" and "How could you think of making the canon source conflict with our fanfics?" And so on. These fans never assumed that the creators were going for the ending they didn't expect.
Some viewers judged Blood+ to be Ruined Forever with the rape/murder of Riku. On the other hand, other viewers thought the series got better after that episode.