I have played the demo version of this game, and loved it to pieces. It was so quirky, so unique. It gave me a whole new dimension when it comes to FPS. Now, to purchase the full game is a dream, and makes it much easier for me. Even so, the game is still as hilarious as ever. Whether it would be Sam's quirky remarks to certain enemies to the game, through to his uncompromising view that everything can be settled by the barrel of his gun/minigun/rocket launcher/grenade launcher etc. (well, the thing is, even the weapons are pretty much extreme! For example, a rocket launcher that doesn't hurt you?)
If you are looking for something fresh, funny (in a very strange way) and just plain silly, well, this just might be the game for you.