Here is what is wrong with it. The special FX are not super. There are points where the graphics look painted on. In one scene, wolverine is examining his claws by moving them around in front of his face, and the CG claws don't track with his hand. Things like this can take you completely out of the movie as you think about how bad it looks.
The plot is not super either. It's full of holes and a bit dull.
The acting was good, though. And the movie was full of action. If you're going to see it, see it on a big screen for the thrill ride.