Red Dawn meets War of the Worlds with a bit of Jericho (melodrama) thrown in. While it had its problems, not a bad popcorn flick. I enjoyed it more than How it Ends! Heh.
How in the world did they do all that in 2 hours? That's a matter of picking the proper scope for the medium you creating in, right there.
They did an okay (slow) beginning. Toward the middle the sped it up with a LOT of montages. Then slowed down toward the end. Really messed up the pacing of the whole thing, imho...