I saw it last night and it was good. It has a good concept and it's certainly better than the AvP films but it did have an air of predictability to it.
Obviously it couldn't touch Predator and I don't think it was as good as Predator 2. I'm disappointed that in the reviews & interviews they are trying to have this running straight after the 1st and ignore the 2nd one.
Although Predator 2 isn't great (Maria Conchita Alonso's acting is probably the worst ever committed to film) it does still have some stand out scenes - the penthouse massacre, King Willy in the alley, Glover's dismissive face-clap, the subway shoot out and the abbatoir attack. Predators had one, maybe two.
So it could be worth checking out, does have some tension and is entertaining but if I had a choice of what to watch again over a pizza I'd still go Predator 1 or 2.