5 stars because i have seen far worse movies than this one and it somehow entertained me. The best idea i have heard so far is that all that happens after the Spaceshuttle is hit by debris the first time is just the hallucination of Ryan Stone (Sandra Bullock). Well this is not what the author intended, but it makes the movie by far better. Gravity starts of very good with realistic Space scenes and wonderful pictures, but when the crew and Spacecraft are hit by debris every realism goes away. It gets so weird i had to say to myself: "forget realism, enjoy the pictures!", but it didn't work out all the time. There are simply too many scenes where a SciFi-Fan (Which i consider myself) simply has more than enough knowledge about space, vacuum and the laws of physics to make the head shake like a nodding-dog on a gravel road. Bullock does a decent job to sell you the story. I really wonder how some people compliment Gravity for "Realism". Still it is a good popcorn movie and for those people who don't care about realism a really fantastic one. You think Armageddon or Space Cowboys was as realistic as Apolle 13? Great! this is your movie! If not, be warned! Gravity wants to, but doesn't obey the laws of physics.