Awesome game, leaves you wanting for the sequel!
Be warned though, this game isn't for everyone, its not something like halo that everyone can get into.
This game is for people with patience, and some good eye to hand coordination, you'll need it for the combat system.
Now the combat system does a lot of things well, such as the awesome cinematic counters and combos(not button combos, it isn't a button masher)that feel rewarding. Most of my gripe with the combat system is that you'll be waiting most of the time for them to attack you at the begining of the game. After a while though*MINOR GAMEPLAY SPOILER* you get the ability to do break your enemies defenses leaving them open for a attack.
The combo system, while simple, is very coordinated to your timing, you have to press the attack button again as soon as you make contact with the enemy.
The story line is awesome as well, and while it may be confusing sometimes, it all comes together and makes sense.
The free running elements and the chase system makes for some very cool moments while your escaping, especially if you find a place to do the leap of faith.
While some investigation missions can get very repetitive, the assassination is where the game shines and just trying to infiltrate a enemies fortress makes for some really epic assassinations, and fun gameplay.
Most of AC faults don't get in the way of this awesome game, but this game definitely feels like a set up for a sequel and heres to hoping its a better game than the original!