Just got back from seeing it. I liked it alot, but liked the setup and the first 2/3s better than the last 3rd or so. I thought the last 15 minutes was just a simplistic monster movie.
Im also sort of tired of the open ended movies that fail to tell a complete story and leave you wanting more..but hey, thats a Damon (Lost) Lindelof specialty now. Meh, ive tired of his little open ended games that never answer anything.
Extremely well made flick, the effects, production design, score, acting, costumes, direction, everything.........