Ok, I just got back from it, so I'll give my point of view:
First, the bad. The acting and dialogue seemed really bad, it almost felt like a dubbed foreign film. At times the film sounded like an old Argento film, which isn't a good thing. Second, the ending sapped some of the energy of the film. Finally, some of the fighting scenes were shot too close.
Now, the good. I really liked this fim! I though it was so much better than the first. There is no shoratge of action, or tension. The director knows his why around suspense/action film cliches. He sets you up thinking it's going to be one way, and goes another. I really enjoyed that. The film moves at a good pace, and has an interesting and , not overcomplicated (finally!) story. All the effects look good. Lots of guns are the icing on the cake for me. AvP didn't have enough weaponry for me; this film satisfies my cravings.
Bottom line; get out of the computer chair, grab some popcorn and red vines, and go see it.