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: Big Hero 6
The Disney film:
Adaptation Displacement: The original comic and characters are obscure enough that no one will be complaining that They Changed It, Now It Sucks, as tends to happen for superhero adaptations. That said, those who do know the source material have started complaining about some of the changes made to it, such as the switch in location from Tokyo to a fictional city and Wasabi-No-Ginger's name being shortened to simply Wasabi.
Awesome Music: Fall Out Boy's Light 'Em Up in official US trailer.
Wasabi and possibly Honey Lemon no longer being Japanese. Also the issue of Fred no longer being Ainu.
People are complaining about how Disney seems to once again be "reusing" the Rapunzel face for female characters.
Whether Disney adapting a Marvel property into an animated film is a revolutionary step for the Disney Animated Canon, or just an example of them forcing the Marvel Cinematic Universe into everywhere. For its part Disney has made little mention of Big Hero 6 being a Marvel property (the Marvel logo is nowhere to be found in any promotional advertising), and has explicitly said it's not a part of the MCU.
Cargo Ship: Many have started shipping Baymax with soccer balls as soon as the first trailer was released.
In Name Only: Many of those familiar with the comics are accusing the movie of this.
Internet Backdraft: The people who hated on Frozen for using similar models for the female characters have now directed their anger at Honey Lemon for the same reasons. This was somewhat mitigated when it turned out to not be her final design, but it's still heard about.