If you don't mind a game poking fun at the current administration and some of the more unethical things it has done... well, you might enjoy shooting aliens in Area 51: Blacksite. It's a gutsy move to make a game so political. The game begins in Iraq, gets weird, and then the characters are fighting for their lives in Rachel, Nevada, a tiny town famous for the rumors of alien crashes and Area 51. The game is powered by the Unreal Engine and looks great overall (although some areas can be on the bland side).
Blacksite is not a bad game, it just doesn't do much except feature a political slant and some squad tactics. The very essence of a rental.