The movie had some plot holes and some weird incosistences - Boston was not even scratched and the people in that house like the mother, the grandfather and grandmother were dressed for x-mas or thanksgiving or something, like they didn't even know what was going on. BUT... the whole grittiness of the film, the realism and the whole setting was quite well done, it reminded of a excelent british film called "Threads", which shows the aftermatch of a nuclear strike in britain (only it's much more disturbing to watch).
Now, has anyone noticed similarities between this film and "Half Life 2"? The main character dosen't knwo what's going on, and we only see what he is seeing, what he is experiencing. There's a bizarre alien invasion and humans are slaved and/or used as a source of energy, there are gigantic Tripod things that beam up a powerful lightining weapon and you might destroy it with a rocket launcher, the army and people are organizing a militia to fight the aliens... And the whole look of the film reminded of Half Life 2...