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.
YMMV: Lego Adaptation Game
Adaptation Displacement: Harry Potter (and, inevitably, Lord of the Rings) is based more on the movies than the original books; though since this is the Cliffs Notes version of the plot anyway, the difference is rarely noticeable.
Complete Monster: Lex Luthor. Brainwashing most of the US to secure his election victory puts him well over the Moral Event Horizon, but what secures his place here is his attempt to tear down Wayne Tower and murder everyone inside, purely out of spite for snubbing him at the Man of the Year awards.
Game Breaker: 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.
The Stud Multipliers, especially as they stack. How does a multiplier of 3840 (2x4x6x8x10) sound?
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.
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 voice acting. Itwasdonecountlessothertimesinthepast. Heck, some people aren't even aware LEGO games before these even existed. To make it worse, the box itself actually claims this is the first LEGO game to have voices, period.
Tear Jerker: The cutscene after you beat the Emperor in LEGO Star Wars II. Nearly every other scene is played for laughs, but the death of Anakin and Luke's final goodbye to him are played heart-breakingly straight.
That One Level: 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 ceertainly 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: this is the second level.
In LEGO Batman and LEGO Batman 2, there are several chase levels. Be assured that, if there is flying involved, you will be intensely frustrated.
That One Sidequest: 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. Have fun!
Actually with the new checkpoint system you can quit the level without saving and start over at at the beginning of the chase.
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.