The X-men movie actually breaks the cardinal rule about big-screen remakes - it's actually good, without totally compromising its origins, or the original intentions! The film is actually really true to the spirit of the comics, and the storyline isn't too far off one that could be encountered - though the time frame has been altered slightly, but can easily be put down to artistic licence!
But don't worry, this isn't a film purely for comic book fans, but actually very much a watchable movie in its own right. It's a great special effects fest, and the characters are solid and believable, even if the plot asks us to stretch out imaginations a little.
The acting is actually very good, though with a cast including RSC trained Patrick Stewart and Ian McKellen, you can't go too far wrong, but they each lead bands of good actors who all-in-all produce a great team effort, and a really enjoyable film!