As I said up thread the only "complaints" I'd have about it is that the time-line seems to be truncated a bit (Eric and Charles become greatest friends, work together, Charles gets crippled and the two have their falling out way too quickly) and I don't think the secondary mutants like Banshee and Darwin and Angel are really interesting enough.
Yeah. I think Xavier getting crippled and Magneto becoming completely "evil" are things that could easily have been saved for the sequel. There is no reason why we had to have everything set up for the first X-Men movie... 40 years later!
Wow, Banshee can scream and somehow use that combined with a wingsuti to... fly. I guess.
That's from the comics as well. I don't think it was implemented all that well.
Didn't help that the effects looked pretty ridiculous! Seriously. I don't mean to harp on a film's effects, but some of the shots in this film were of SyFy movie of the week quality!