Yeah. The ending was cool, it left me too excited for the second one. If you used the eagle-sight or whatever it is called (only able in the last stage of 'real life') you can see Blood and mindless paintings and satanic pentagrams which is really creepy.
AC2 will be kickass. But it has much of the same game-play style though, i heard. The climbing is the same, there is still a low and high profile, the combat system is abit different.