I think P2 was relatively successful.
I'm not saying the original should be disregarded, and I definitely love it too, but do we really want a bunch of commandos or Marines killing predators over and over again for 35 years?
I also think the teenager aspect is being underestimated, as Tstyx pointed out; I don't think Comanche teenagers are going to play a role akin to Pocahontas.
Everyone's entitled to their own opinion, but I feel a lot of closed-mindedness, hopefully this will be the first good predator movie we get since predators.