Great with new features and some differences from the other Rainbow Six games.
Some of the new features on the game are :
Take Cover ( I just loved it ) - You can take cover and once you press the basic keys ( W , S , A , D) your character just shows your face out of the cover to aim your gun, but you can still do the blind fire , without showing any part of your body. Amazing!
Auto Healing - Like Call of Duty 2 , there's a new auto healing system, your vision gets kinda weird until you're fully healed.
Many more features.
Performance : I can't say its very good, It requires a very good system to play it. Like SM3 GPUs only... Graphics : Not that pretty, but it's ok, models are good but, not that good if compared to other games, the graphics on the maps are good.
Gameplay:
It's tactical like all other Rainbow Six games, but on Vegas, it looks more simple than the others, not much different tough but those new features which I wrote on this review makes the gameplay better and lovable.
I enjoyed it even without using the max quality of the game, I recommend this game.