The game is a great idea, but THQ should've made the game like Stubbs the Zombie!
The graphics aren't really great, the story is what you'd expect from a game based on aliens on earth (that's a good thing!), the gameplay is fun (using mind control or extracting people's brains), but for me, one of the biggest drawbacks was the choice of weapons. There aren't much weapons available in the game as others, the only good thing about these weapons is that they can cause total destruction, and if you run out of ammo, you can just use your mind control to throw objects (even people!)
Fun idea, o.k. graphics, decent sound, easy controls, and the gameplay (AI, weapons, characters, enviroment) is decent, this is a game I would rent first.