The only one I consider decent is First Class, because it did not have Wolverine as a main character. I think Hugh Jackman plays the character fairly well, but X-Men never had a main character. It misses the point, and in doing so they have butchered many other characters and some really good stories.
I am the kind of person who can separate different versions of media quite well. I can enjoy a movie that did not honor the book as well as people would have liked, I have enjoyed the Transformers movies, Planet of the Apes remakes (even the first attempt that flopped), and countless other things. But when I look at the X-Men movies as just movies and ignore everything I know about the characters and story lines they try to do...the movies still suck.