I think it's fine, neither good nor bad, and that's the problem.
I love apocalyptic movie scenarios but this one needs to hitch up its skirts and run a little harder rather than strolling thru the end of all things. A little bit more tension would be nice, some slightly better dialogue would be lovely, a stronger ending would be fantastic, but it just isn't there.
So, it was fine... And that's about it.
