First off, this is an excellent game. The game is a predominantly multiplayer First Person "Hero Shooter", in that rather than choosing a personalised loadout for your character, you play one of a roster of characters with their own skills and weapons. You really need to learn each character's strengths and weaknesses if you want to do well in the game.
The game very much requires a decent level of skill and teamwork for you to do well. Communication is key in both the terrorist hunt modes and multiplayer, so the game really shines when you play with a group of friends.
Graphically, the game looks superb, running very smoothly even when there's a lot going on. It's the sound that really stands out, though. Guns sound powerful, and the muffled effects of enemies running around in neighbouring rooms is impressive.
If you are a fan of the previous Rainbow Six games, this is massive departure, not an unwelcome one. Even better, this copy comes with download codes for Rainbow Six Vegas 1 and 2 for Xbox 360, which can be played on Xbox One.