I agree that it's all about personal interpretation which can be wildly different from one fan to the next. I also don't disagree that TDK & X-franchise aren't perfect comic-book replications but the complaints from the fans are not very strong when the films are very good as long as they don't deviate TOO much. If you go too far or make a ****e film you're gonna get & probably deserve a lot of criticism.
Making significant changes is completely necessary when making these films but it takes skill to ensure the identity of the source material is still strong while making a good film.. or you're just left with a good film. Schindler's List is a great film but I'm not going to be rewatching it 20 times & wasting time speculating about sequels on internet messageboards.
t:
If you exclude the very stupidest comic fans, I think there are many who are sensible with their criticism & know when to speak up & when to shut up. First Class has quality written all over it but Vaughn now needs to make sure it feels like an X-men film, which he's certainly capable of doing.