I watched this last night, mostly due to have a look-see at what all the interest in it is.
I did like some of it, some of it, no. It was worth watching, I don't feel like I wasted my time, it entertained enough.
As many have said, Bullock's character was an extremely unlikeable person. And near the end we find out that she'd never given the 2 kids names, people will give goldfish names and they're likely to die in the first 6 months.
Other than that, one of the points that really stood out to me was what the RLM guys said, that the structure of the storyline ruined it. Showing the later years inter-mixed with the starting ruined the questions over who will survive to the end.
I did like some of it, the start of "the world is fucked, how do we survive?" was played out well and it felt frantic and real. It's just a good element to bring to any film, that extremely high stakes situation.
John Malkovich was also really good. The silly, but seemingly self aware silly-ness of driving their car to the supermarket using the GPS and parking sensors, meh, whatever, I went along with it.
Then the ending felt flat, and so damn unrealistic.