Skyline.
Fairly so-so CGI flick - apparently made on a small budget. it looked nice on the smaller screen, but that was all it was, a vehicle for special effects. Very derivative special effects, you've seen them elsewhere.
Not much of a story either, they evidently didn't save any cash for a screenplay. Followed the the recent theme of having main characters that you wanted to see have a grisly demise (à la Cloverfield). They probably gave the aliens indigestion. A shame really, a little invested in character development and writing would have made for a decent movie.
Very short movie too, it kind of just went pop after about 80 minutes.
Oh, it was OK. Preferred Monsters.