It's very close to 5/5, I just didn't come away from the theater excited. This is the best hard sci-fi movie to come out in a while, though, so if you like sci-fi definitely go watch it. Of course, if you've seen the trailers I don't have to tell you it's more 2001: A Space Odyssey and less Independence Day. The pacing is very slow, but it's so that you can think about what they're telling/showing you. Also it's got great cinematography.