Pojo,
Second Sight was an awesome game. I loved the plot for it, and it was the first Xbox game I had ever played. I definitely think that it didn't get the hype it deserved -- I think Psi-Ops: The Mindgate Conspiracy overshadowed it in that regard, but Second Sight was by far a better game.
As for my favorite game, I'm sure it's been said time-and-time again from me .... but it's DooM. Not the new one, either -- the old one, from '94. I would have to say that my second favorite game is Castlevania: Symphony of the Night, which them brings me on to the rest of my list.
3) Final Fantasy VII - No game has ever made me cry the way this one did.
4) Prince of Persia - This one refers to the original one, released in the early 90s. I really love the new series, too, and I cannot wait for the next one... but the first one is a classic!
5) Driver - The original one was absolutely amazing at the time, and seemed to set a new bar for games that followed, like Grand Theft Auto 3.