I found Wolverine: Origins painful to watch. Not only was it a poor movie to begin with, they completely butchered my two favourite Marvel characters (Gambit and Deadpool) in their live-action debut.
First Class was a slightly better movie, but it was obvious they had no regard for the actual characters. It's a movie for people who really aren't fans, and I think that's a bit of a shame.
So if you've seen the movie, and have noticed the many parts of it where it's completely against canon, post them here, and say why you didn't like it, or why you didn't mind it. I'm not going to post any in the first post, and many may include spoilers.
Edit: Since many can only think in black and white, let me emphasize something. No one expects a movie to follow the comics completely, but I would expect at least an effort to stay true to the characters. There's a middle-ground between being 100% true to the comics and disregarding everything that doesn't suit the movie execs desires.