If you own Rainbow Six Vegas' first installment, pass on this one. Ubisoft has greatly improved the choppy online performance and sound glitches, but that's about it. They still have the same maps, save two or three, for online play. Do yourself a favor and get Call of Duty 4: Modern Warfare.
Compared to the first one this one is better. The new character customization is a nice addition. There are a few glitches throughout the game that are quickly overlooked by the fast pased game play. If you've never played Rainbow before your not missing anything. This is not a sequel but a continuation. The game play is pretty much the same as in the beginning. This Rainbow strays from the Vegas strip and spills into the back alleys. The environment is more industrial. If your looking for another COD4 this isn't it. If you want a solid first person shooter this is.