Features:

• Explore Vegas hot spots as the environment changes from dusk to bright daylight to dawn
• Multiplayer includes 11 smaller maps that force more intense face-offs, 2 adversarial modes, more rewards, and easier access to matches using the improved and intuitive matchmaking system
• Create your own identity that stays the same in both single player and multiplayer modes and progresses as you do
• Turn single player mode into co-op mode at any time, just by jumping into the game
• AI is more challenging than ever

Rating : - Not as good as RSV1
If you get this thinking it is a sequel, going to start off right where RSV1 stopped then you are not going to be happy! This is more of a paralell story than a sequel. It should not have been called Raibow Six Vegas Two. Maybe RSV1.5 but not RSV2. I really wish the very first mission would have started out exactly where RSV1 left off.
The game is short, and online offers nothing better than RSV1. Basically, it does not live up to the hipe and expectations. I gave the fun level 3 stars as I do enjoy this style of gaming but enemies span in right in your face and kill you in terrorist hunt, not all shots are equal. One shot from a shotgun might kill one bad guy but the next might take an entire magazine. The AI pulls miricle shots, shooting with thier gun facing a different direction but you die anyway. Campaign may be short but it is nice going through it with a friend.
It seems they pulled a GRAW to GRAW2, should have been downloadable content instead. At least GRAW2 added some "new" toys RSV2 only added the ability to sprint. Play Call Of Duty 4, it is better.