Great game, but not without some flaws
The graphics in this game are so far out of the league of the majority of most other titles that it's staggering. Altair and the world around is so detailed and photorealistic the game is worth buying for that reason alone.
The music in this game is also amazing, it is choreographed very well, and fits the game. As the action gets hot, the music picks up and makes it that much more awesome.
But where this gem takes a wrong turn is that the general structure of the game is very very repetitive.
Enter area, Do six investigations, Climb 10-ish buildings, Save 10-ish villagers. Repeat 9 times.
The bests parts of the game are the very beginning, whenever you are about to assassinate a main target and then escape, and the very end of the game. If the rest of the game had the same edge-of-your-seat action as those parts did, this game would be hands-down one of the best games I've ever played.
The only other problem I had with the game was the perpetual guard fights. Maybe I just tend to get in a lot of trouble, but whatever the case, sometimes I just wished Altair would just change his super-suspicious clothing, haha.
Other than the problems, the game is amazing, and is a must own for the Xbox 360. So quit reading now and buy it. I mean it. So here's to hoping that Assassin's Creed 2 fixes the structure problem! :)