I was going to point out Assassin's Creed but as it has been mentioned by numerous sources and also the fact that, as Rochnan has, stated, although the game did have it's flaws it wasn't exactly received terribly. I'm still hoping the sequel will be an improvement though. As well as not being set during the 18th Century. I wouldn't like that at all.
Outcast. Don't know how many people will remember this one, it came out back in the time when PC games were stilled sold in those monstrous cardboard boxes. Some publications slated it as being pretentious (as well more petty complaints such as the way the main character moved and the colour of his shirt) but I thought it was damn fine game regardless. The ending was quite emotional I thought and even made me well up a little. I was looking forward to the sequel, so was crushed when I learned it had been canned.