Time out for obligatory clichés: Obnoxios dumbbell TV news crew getting in everybody's hair. General wants to nuke something. Hero guy is married to scientist, and they argue a lot. Their stupid brat kids blunder into perilous locations, always at the exact time and place meteors show up. Hero guy diverts from saving the world to rescue his idiot brat kids. The ratio of cliché stuff to actual plot elements is about 70% to 30%.
The pseudo-scientific ramblings about why San Fran is being singled out are actually pretty imaginative (although ludicrous). Acting is fair. Action and CGI are fair. 99% of the budget was invested in the 500th movie depiction of the collapse of the city's most famous structure. It's done in spectacular fashion; the film's blazing glory moment. But sloppy editing also gives you glaring goofs: like light traffic in the background of a scene, during a supposed massive evacuation of the Bay area. Some evac.
As cheaply done as it may be, it's amusing enough to make it entertaining.