-Beyond Good & Evil - I thought I would be the first one to mention this, but license and Roto beat me to it. Wonderful game, everyone who doesn't have a copy, go out and buy it. The game is only about $9.99 now, and is on every last gen system, there's really no excuse not to have it.
-Oddworld: Strangers Wraith - Has more innovation in it's gun's than most games have in their entirety.
-Max Payne 2: The Fall of Max Payne - I just don't understand why barely any people bought this game. I absolutely <3 the series, and it's Finnish developers Remedy.
- Ico - I've heard it been called the overrated underrated game, and I kind of agree.
- Grandia - I'm a huge fan of the games, and this series needs more people to support it.
-Psychonauts - Such a great platformer, and it really disappointed me that barely anyone has bought the game.
-Anything developed by Clover. I honestly think even the Viewtiful Joe games are underrated.
Keep a look out for: Alan Wake - It's coming to PC and 360, and is being developed by Remedy. (Makers of Max Payne Series) So far it's looking absolutely wonderful and I just want this game to get the recognition that it will definitely deserve.