As others pointed out it's I believe it's the nostalgia factor or some very fond memory that can drive people to go into blood rage induced rants against something that is done on a previous film, comic book, song, game, and what have you.
To me it looks like people tend to put these past versions on a high pedastal and refuse to have anything else come in and share the spotlight with them. Feeling it makes it less special if there is another version out there. Going out to call them clones, mockeries, 3rd rate attempts. Not giving them a chance mostly because to it fails to capture the sense of awe and wonder the past version did with them or it's not something they're used to. To view it as some kind of insult to the original vs. a homage.
To get upset just because someone decides to change or put an alternative spin on a favorite series is just ridicu... What's that you say, Megatron has been redesigned as a road warrior style semi-truck for the 3rd Transformers film. Hmmm, excuse me will I go to Hollywood and pound Michael Bay's head in with the Matrix of Leadership.
