I saw this on pay-per-view over the weekend, and I didn't think it was that bad. Sure there was a lot of unintentional (I think) humor, but it was better than The Village.
I took it, as kind of the science equivalent of Signs.
I would say the message of both films is that Religion and Science are both just constructs that humans make up to try to make sense of the unknown.
Also, that coming up with all the answers is for the arm-chair quarterbacks after the fact. What matters during a crisis is surviving the crisis.
But then, you get the odd juxtaposition at the end when our two lovebirds give up surviving and run out to hold hands among the plants, so maybe that surviving bit was optional.
Anyway, not the worst movie I've seen...even last weekend. But, then last weekend I also watched Donnie Darko and Dracula Has Risen from the Grave, so maybe it just seemed better in comparison. I'd give it a solid C.