Here's my short review of the movie -- (SPOILERS AHEAD)
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If it gets people to prep, then great. If it informs people about what the Bad Guys have planned, and wakes a bunch of people up, then great!
But the movie itself is a bit derivative and over the top at times. The CGI special effects (things on fire, etc.) are certainly not up to current Hollywood standards. It's great what you can do in a garage these days with a single home PC -- but no one's going to mistake this for a Hollywood production.
There were a lot of stereotypes in the movie -- that's why I call it "derivative". It derives from existing works. The main bad guy (who orders the weapon to be deployed) reminds me of the bad guy in Lethal Weapon 2 ("diplomatic immunity"). And the main bad guy closer to home, the Russian menace, is a stereotypical "Russian bad guy".
And don't get me started on Sarah Connor. If you've watched the movie, you know who I'm talking about. She even LOOKS like Sarah Connor (from Terminator) superficially. But she's a female badass, drinking straight alcohol, smoking, gun-toting, shoot the fly off a bull at 1000 yards, military tactics expert, etc. I'm not QUITE ready to declare her a Mary Sue, but that's about all I can say. She does depart from Sarah Connor however, because the real Sarah was more vulnerable and female, and wasn't a friggin INVENTOR as well as military badass equivalent to the best Special Forces/Navy SEAL. Maybe it's a testament to how bad Hollywood is that I can say, "I've seen worse".
There were some parts that were downright cheesy. When the high school degenerated into a B-movie horror flick on the FIRST NIGHT after the "power outage", with a couple of guys wearing masks and toting meelee weapons (axe, baseball bat, etc.) -- that seemed a bit out of place. They seemed to control the whole school too! They had at least a half-dozen girls lined up, as they shouted and threatened them, "Where is the politician's daughter?" Penny had to hide from them and you ended up with a classic thriller/horror trope of a main character hiding from and being chased by a somewhat mysterious, malevolent force. The excuse was that she was the "politician's daughter". As if high school students track politics that closely, or give the first crap about politics! Come on. They barely know who the president is, much less the representatives of the Texas State government in Austin.
As for the writing, well, you could see everything coming from a mile away. When the soldier (one of the main characters, the "son") has a conversation with a fellow soldier, who tells him "if something happens to me, this voice recorder is yours." You just KNOW he's going to die. Some of these writing tricks were necessary to fit so much movie into 90 minutes. Maybe they should have made it 2 hours, or had a less ambitious scope? On the other hand, I don't think they fell into the opposite trap of slow, plodding pace, with tons of exposition. Or maybe I just didn't notice it.