First off: it's ultraviolent, it's sometimes depressing, there one 2-second "gentlemen, avert your eyes" blip, and there's lots of swearing. But it's the best movie I've seen in a while, and it's certainly the best X-men movie to date. And the little girl is awesome!
It's a very emotional and emotionally mature movie that takes its subject matter seriously and delivers on the payoff in heart-pounding, tear-jerking realism.