The movie is very tense overall, and I liked the aliens and the premise for their arrival - they have a very formidable method of attack. There were several parts of the story line that lacked cohesion and maybe some plausibility, but hey, half the time that's just sci-fi. But what you need to be prepared for is that you will have to wait for the sequel to find out anything meaningful about a resolution. As long as you're good with that, and you have an extra $12 sitting around (see it in 3D), it's worth seeing, although not a knock-your-socks-off hit.