I really don't think this movie sounds bad at all.
Sure, he think that the acting is bad, but that's just his personal opinion, and don't have to be true at all. In every video clip and picture we have seen of the Chet Vs Wolf fight, there have been no problem telling who is who, and I don't think there will be in the movie either.
Besides, is there anyone here who was really surprised that both the predator and the aliens died in the explosion? It's what I expected all along anyhow. And I also love that Ms. Yutani has a small part in the end. That's a amazing way to end it in my opinion.