These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Harry Potter and Lord of the Rings/The Hobbit are based more on the movies than the original books; though since these are the Cliffs Notes versions of the plots anyway, the difference is rarely noticeable.
There's a bit of this in Marvel Super Heroes, too. The characters from the Marvel Cinematic Universe are based off of those designs while the X-Men seem to be based on the 90's cartoon show, and thus the Jim Lee designs. (Except Wolverine and Storm, who have their Astonishing looks). Beyond that, the game takes a Pragmatic Adaptation approach, mixing and matching various portrayals into a new whole—including one level featuring the both the comic and movie versions of the Mandarin (the Yellow Peril-style one and Aldrich Killian).
Voldemort is ridiculously easy for the Final Boss of Harry Potter: Years 1 - 4.
In LEGO Indiana Jones, the final bosses of their respective movies had "Hit and Run" or "Escape" strategies, so the fights were just running around hitting the boss. The sequel looks to remedy this though with the encounters mentioned on the page, by changing up the events of the films a bit.
The fight with Blackbeard is considered as such by some, probably helped by the fairly unique way of fighting him.
So is Palpatine due to a change made to the movies to match with how the games play: Vader pulls his Heel-Face Turn early, leading to Luke and Vader vs. Palpatine. Helps that he's something of a Final Exam Boss.
Marvel Super Heroes' final battle against Galactus quite possibly dwarfs them all (no pun intended), which is especially notable since this game has many other boss fights that could be included here.
The Original LEGO Star Wars was great, but rather limited, but when 2 came along, it got rid of several of the limitations, becoming a bit more fun. The Complete Saga could count as well, since it revised the original game's levels to take in the newer gameplay elements of the second game.
LEGO Batman was a good game with some great starting points, but when 2 came along, we got a (slightly) widened ensemble cast complete with all the improvements that had been made since the first game, such as free roaming. Oh yeah, and actual voice acting allowed for a better plot.
Superman can't be killed (by anything without Super Strength, at least), can fly, destroys everything he touches in the overworld, and has four different abilities. Wonder Woman and several other Super Heroes count but Superman is unlocked while the main game is still in motion.
Invincibility is featured in all games as a power-up to unlock. Granted the games are already simple, but some of the in-game cheats provide effects that are God Mode incarnate. EspeciallyStar Wars: The Complete Saga, but that game has thirty six stages to search compared to the others so it makes perfect sense. LEGO Marvel Super Heroes is thus far the only game to not include it as a cheat.
In LEGO Star Wars 2, you can unlock the force ghost versions of Anakin, Obi-Wan, and Yoda from the end of Return of the Jedi. They are 100% invincible and don't even loose studs if they accidentally walk over a ledge though granted those characters are extremely expensive and only unlockable when you've completed all the levels.
The Stud Multipliers, especially as they stack (except in the DS versions, save Rock Band and Indiana Jones 2, where you probably have gotten everything anyway). How does a multiplier of 3840 (2x4x6x8x10) sound?
Probe droids fighting in the Battle of Hoth will launch their own tow cables to pull the bombs you tow.
Rocket troopers from LEGO Indiana Jones.
Growing the Beard: Developer Traveller's Tales was not held in high regard until LEGO Star Wars.
Hilarious in Hindsight: During Stan Lee's first cameo in the Simpsons, there was his comedic line: "He can't be the Hulk! I'M the Hulk!" and then failing to transform into the green giant. Fast forward to 2013, and Stan Lee in Lego Marvel can transform into the Hulk.
Ho Yay: Ron under the influence of a love potion. In the book, he babbles about Romilda Vane. Here, he fawns over Harry... and Professor Slughorn.
Iron Man outright refers to his mission with Thor as a "date".
Joker is rather...flirtatious with Lex Luther.
Joker:Oh, Leeeeex? [holds up kryptonite] It's a boy!
It's the Same, so It Sucks: Easily the most common complaint about the series - the games are in essence Strictly Formula with only minor differences. Even many LEGO fans aren't interested in the later games for this very reason.
Lex Luthor easily crosses it by trying to murder everybody in Wayne Tower, because Wayne snubbed him at the Man of the Year Awards.
Loki crosses it in the penultimate mission by revealing that he plans to mind-control Galactus into eating both the Earth and Asgard. This disgusts the other villains (on grounds of pragmatism to a degree, admittedly) into joining the heroes to help fight against him.
In LEGO Harry Potter, EVERY student you pass greets you with the same high-pitched "Huh Nuh". In a castle full of dozens of NPCs, this gets ear-grating after the second screen.
Nothing's worse than the Mandrakes. As soon as you go near them or pick them up, they start screaming and don't stop until you put them in the pot.
Ghost Rider's laughter in LEGO Marvel Superheroes can get very grating.
Narm: The final battle with Galactus on the Helicarrier is epic, but slightly ruined since Galactus never shuts up and repeats the same 4 or so lines on a loop. Hearing "Foolish creatures, to come between Galactus and his meal!" every ten seconds sort of lessens the effect.
Nausea Fuel: The "Dynamic" split-screen, when you have one co-op character flying around and another standing still trying to do an aiming task; or even worse, when both are in flight. In different directions. Etcetera.
Nightmare Fuel: Venom's first appearance in the campaign game (Marvel Super Heroes), in addition to counting as a Jump Scare, is just plain... eeeuuuuurrrgghhhh. Even as a LEGO this guy is never going to be cute. Watching the symbiote reacting to loud noises by peeling off the host is also nightmare-inducing, even though it's just brick characters.
Numerous features introduced in the LEGO Star Wars sequels actually made their debut in the Gameboy Advance version of the first game. For example, the Jedi Mind Trick, Lightsaber Throw, and invincibility power-up, which would not be introduced to the console versions until The Original Trilogy, The Clone Wars, and The Complete Saga, respectively.
Zig-Zagged with the voice acting, as a lot of fans reacted in over-the-top ways when they found out LEGO Batman 2 was going to be the so-called "first" LEGO game with it. Itwasdonecountlessothertimesinthepast. Heck, some people aren't even aware LEGO games before these even existed. To make it even more confusing for the non Xbox360, PS3, PS Vita, PS4, Xbox One, and Nintendo 3DS owners, and to add the confusion for the PC Owners, the box itself actually claims this is the first LEGO game to have voices, period.
Seeing the same types of hints/restrictions for the same types of special blocks/switches every single time you pass in front of them, especially when trying to solve a completely different puzzle in the same area, gets very irksome.
Lord of the Rings. The Dead Marshes. Gollum's "This way, hobbits!" very quickly becomes a Most Annoying Sound.
Lego Star Wars 1 was a suprisingly good licenced game but Lego Star Wars 2: The Original Trilogy added a lot of improvments like Melee attacks for all characters, allowing non-force users to build and adding Gold Bricks for bonus content.
Lego Marvel Superheroes is one to Lego Batman 2: DC Superheroes in terms of open world super heroing with improved flight mechanics, a more interesting overworld with different sidequests and remembering there was more than 3 superheroes to play as.
The podrace in the first game. The player must finish nine different sections of the race under very strict time limits and so as even slightly grazing anything is instant death. Thankfully The Complete Saga removed these problems but left the original Nintendo Hard version in as a Secret Level.
LEGO Batman. "Zoo's Company". Lily-Pad Bouncing Segment. That is all.
"Crab Cake Confusion," the Treasure level in the wreckage of the Coronado in Indiana Jones 2. It's really only a scrappy level due to the way the game's jumping mechanics work (or don't) and the platform placement.
"Perilous Parking" in the Berlin stage requires you to jump a Jeep onto a fairly small platform, ride a badly-controlled motorcycle up a ramp, and jump a horse across several high columns to weigh down buttons.
The Forbidden Forest levels in Harry Potter Years 1-4. Not particularly hard levels, but there are a lot of lego flowers and bushes lying around and if you want those LEGO studs for True Wizard (not to mention buying unlockables), you need to spend a good amount of time destroying all of them.
Motorcycle Escape from Lego Indiana Jones is an absolute nightmare from start to finish. From the moment you leave the first area you're assaulted non-stop by enemies with guns that appear about 4-6 at a time and respawn after about 5 seconds. You can't attack from your motorcycle, so you have to constantly dismount (or stop the puzzle you're solving) to deal with them. As if that's not bad enough, the last area of the level contains four turrets with one-hit kill rockets that are nearly impossible to avoid, and more infinitely respawning enemies that now have one-hit kill rocket launchers. Have fun!
Vehicle levels tend to be rather annoying in general.
Flying levels tend to be some of the most frustrating in the LEGO Star Wars games, due to piloting controls.
LEGO Indiana Jones has vehicle races within level hubs that are particularly frustrating due to twitchy controls and cumbersome terrain (especially if the screen is split in half by two-player mode).
"An Icy Reception" in LEGO Batman. Almost the entire level is situated on catwalks over a precarious Bottomless Pit, and some of the platforms have rather dodgy hit detection. Filling up the Super Hero Bar is more or less impossible in story mode due to the incredibly strict amount of studs you need. It certainly doesn't help that Mr. Freeze is That One Boss who can kill both players in less than one second. To top it all off, it's the second level.
In both LEGO Batman games, there are several chase levels. Be assured that, if there is flying involved, you will be intensely frustrated.
Lego Batman: Arctic World's minikit canisters on the ice slide, where you have to pass through five or so gates. You only get one try, and if you mess up, you have to restart the lengthy level again.
A few of the levels in LEGO The Lord of the Rings, particularly "The Black Rider" and "Mount Doom," feature high-speed running sequences. There's usually a treasure minikit hidden in one spot during these, and you only have one chance to get it each time you attempt the level. The altered checkpoint system does alleviate this a bit by allowing you to quit the level without saving and start over at at the beginning of the chase, but it's still not easy.
The Slytherin Crest in the "Magic Is Might" level of Harry Potter 5-7. Not only is it hidden behind a pillar, but you are being chased by Dementors so you have very little time to detour for it. Plus, if you miss it or get caught by the Dementors, it respawns you after the Crest, so you have to play through the entire level and redo the very long boss fight for another shot at it.
Racing missions in LEGO Marvel Super Heroes can be a real pain, especially if you're flying or racing another character.
Pandering to the Base: There was a fan campaign to have Venom be a Big Fig or be able to turn into one (to more accurately represent the fact Venom is huge). They actually succeeded and Venom can turn into a Big Fig. Before this, Gambit was one of the characters put in because fans really wanted him in the game.
The Problem with Licensed Games: Given the positive response the series has been getting over the years, this has been handily subverted. Note that each game technically comprises two licenses, making it even more of an accomplishment.
They Changed It, Now It Sucks: A self-contained example, several fans were let down after finding out that Green Goblin could not transform into Ultimate Green Goblin, despite early demo videos showing that he could.
LEGO Batman 2 was promoted with having other heroes from the DCU available, but, in the story, only Superman and his supporting cast get any focus. The rest of the Justice League only show up near the end.
They implement the traditional Kryptonite weakness in the game, but don't utilize Metallo as a boss fight.
Well, they're LEGO figures, so they were never meant to look realistic, but in the first two Star Wars games the character's eyes were plain black dots that seemed rather ... soulless. The later games fixed this by adding a white dot inside the black dots that could act as a pupil.
Earlier pictures of Thing for LEGO Marvel showed him with a nose, which it rather out-of-place for a Lego character. Thankfully, it was removed for the final game.
Also from Lego Marvel, the Statue of Liberty under Magneto's control. There's something so eerie about the motions of the statue, and watching her casually remove her own head with zero change in her expression... *shudder*
Unfortunate Implications: Literally all of the non-white characters in LEGO Harry Potter are grouped together in the character shop, even those in different years, houses, and points at which they're unlocked.
Video Game Movies Suck: Inverted depending on your opinion regarding LEGO Batman: The Movie - DC Superheroes Unite.