I just got back from seeing it. It's better than the dire AVP1, but that's
really not saying much. The film really didn't have any ideas of it's own, most of the scenes/ideas were ripped straight out of Aliens and/or Predator, now whether this was intended to seem like a homage i don't know, but it just came across as a crappy rehash mixed with a terrible teen slasher like another poster said. The humans were really rubbish, both in their acting and the uninteresting characters that they were playing, i actually groaned when one of the character's names was revealed to be 'Dallas' (also the name of the captain of the Nostromo in Alien. Hmmm, original!), the "teenagers" who all looked about 30 were just an annoying distraction, with one scene in particular involving the main girls arse being totally out of place in an Alien film, and don't even get me started on Reiko Ayelsworth's Ripley clone! I actually think the film would have been infinitely better if no human characters had been involved in it at all, even without any dialogue, a lone Predator hunting Aliens to clean up its mess is a good idea, but throw humans into the mix and we get this abortion of a film.
Completely devoid of any tension whatsoever, a poor cliched script, and an ending that suggests that AVP3 might be a possibility.........
One thing i did like about it though was the way that the Aliens were actually puppets/costumes like they used to be in Alien/Aliens as opposed to the crappy and non-frightening CGI ones that we've had to endure in Alien 3, Alien Resurrection, and AVP1.
Here's a message to the idiot(s) at Fox who keeps greenlighting these terrible films: Stop ruining 2 classic franchises at once! Stop it now before it's too late!!!