I decided to get this game because the guys who made this game also did Mercenaries, another fine game. Thankfully, this game is as well.
Its a really neat game in the style of those old school 50s alien flicks. You get a flying saucer where you can blow the living hell out of pretty much an entire town. But the real fun is disguising as a human, and reading other people's thoughts. I wont spoil any of it for ya, but I can assure that its a hoot.
Oh yeah, and theres also a anal probe gun. No alien invasion game is complete without anal probes.