This movie received a lot of negative reviews. They are not unjustified. Unless you really like comic book character or super hero movies, I'd say give this one a pass.
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.
This is arguably the 2nd best Star Trek movie (2nd to Wrath of Khan.) I think it's one of the best scifi movies ever. Whether you're a Star Trek fan or not, I think you'll enjoy it.
If you are a Star Trek fan, there is plenty to like. In particular, Dr McCoy was great. There are other great injokes and plot points that are put there just for you.
Due to a time travel paradox, this is a different Star Trek than the original series. The characters are very similar; but not the same. And the universe has been irrevocably changed in ways that will give future movies new plot points to follow.
I'm looking forward to future movies with this same crew.