hmm I recently voted in a poll the best game of 2008 and I said Gta IV but yesterday I've played this game and if I could vote again I would say "Assassin's Creed FTW !!!"
The game is absolutely gorgeous, for a while now I haven't played such an entertaining game. I installed it yesterday at 6 pm and I quit playing it at 6 am to get at least 3 hours of sleep before work. I almost called in sick to keep on playing it :)
Here are some compelling images: