I should add on one tidbit of info-
I don't know the comic book storylines of X-Men and all its characters. I am not a nerd/geek with regards to every minute detail of the characters. I could care less how "true to roots" the movie is because, quite frankly, as a kid growing up I could care less about comic books and such.
Having said all of that, and being your standard movie goer (instead of comic book geek, or X-Men nerd fan), I keep my review as is. So I guess if you are a pure fan, and you know every line of every comic book... then you probably won't like it. I don't know every line, and I liked it. Take it for what it is.
Now- I am a nerd/geek with Star Wars... not as much as other people, but I know more than most. So you can label me with that tag