[barnstenchfartface]

That's such a false equivalence. American comic book adaptations are very rarely actual direct adaptations from specific comic book stories, so they get away with taking liberties. When they're advertised as directly adapting specific things though, whether it's comics or books or whatever, people definitely start looking for proper, faithful adaptations.

Plenty of people have Opinions about those things, it's not an anime thing.

Even if you take an adaptation to be its own thing, (which hey, you definitely should, judging things on their own terms is the right way to go) that doesn't somehow make a garbage adaptation stop being a garbage adaptation, and if the adaptation bastardizes and shits on everything that made the original work good, people are gonna complain. This isn't a complicated concept.