Well played a fair bit of it yesterday and it's quite good. There's nothing that really stands out just yet but I'm only a few hours into it yet. There are in game challenges set by the guilds that grant you more favor from them (not sure how favor works yet) and you can upgrade shops all over rome to improve the area. Some area's require you to take out a tower that is controlling the area first. The storyline hasn't grabbed me yet but has some good potential.
The Multiplayer is intense. You have to hunt your target while avoiding your pursuer. It can become a bit hair pulling at times but it's really fun. You are rewarded for the quality of your kills, not the quantity. So if you run around the map getting say 15 poorly operated kills, you would lose to the guy that stayed in the shadows and performed 5 stealth kills. It actually pays off to play the game properly. It's actually a very well designed multiplayer. Only problem is connecting to a game takes forever.
But all in all, I'm very happy with it.