Some minor improvements could be made to the movie. I'm not knowlegeable about all the details, but I know Wolverine isn't supposed to be Superman. Meaning, bullets don't spark and bounce off when they hit him. So I why the scene in which he runs from weapon-x facility and all the guys are shooting at him... Why are the bullets making sparks on wolverine's body and don't pierce into his body and eventually come out through his healing?
I understand that they made some changes to the origins to make it a movie which they might have felt necessary.
Final comments... The movie is really good (from the bottom of my heart). I enjoyed it a lot and am gonna watch it more times with my friends. And I am worried that piracy can damage the movie business.