I just watched "Battle: Los Angeles" at Saturday Morning Cinema in the living room.
It's fairly enjoyable, a cross between any number of war films and Independence Day. It's not as good as Independence Day, and does suffer a bit from the sort of gung-ho US Marine attitude you see in many films (I have no idea of this is realistic or not, having known only a smattering of US Marines, and none of them in the middle of a gun fight!)
There's slightly more story to it than I thought after the first half hour or so, although clearly a lot of it is running around shooting aliens, and trying not to be shot, and frankly the aliens really need to think about how they organise their military system, given how easily some elements are defeated. Suspending belief as regards that, it's not too bad, and the special effects and battle scenes are very well done.
Apparently the DVD/Bluray isn't out for a couple more days, but Amazon seems to be overly efficient, which I'm not complaining about!