I am a huge fan of scifi and this movie promised to be something really good. Its not everyday you get these two actors together so I was looking forward to seeing it. It was excellent up to about half way, when they kill off George Cloony. Such a pity as from then on you get an overdose of Sandra Bullock that is rather over the top and not credible. she needed a second protagonist to maintain a thread of credibility and did not deserve having her part in this movie ruined by this weak ending. The jumping off from one base to another was ridiculous and so was the haphazard button pressing or the grand finale. if I had seen just the second 50% of the movie by itself I would have given it 3 stars, as it is I gave it 5