If you're new to the Rainbow Six games and don't already own Vegas, this is the title to have. The last review is accurate in that it's not a terribly convincing sequel, especially when it's full game price. However, if you are new to the series, there's no two ways about it – the extra features and play styles make it the pick of the litter.
I've been hammering Vegas 2 both via LAN and internet, and it plays very nicely indeed. Of course, the only thing that disappoints me is that Terrorist Hunt is limited to four players (of course this is because sending ten dudes in would be haphazard at best) otherwise, brilliant.
The system requirements seem high, but in reality it's playable on a fairly broad list of machines, I've seen it playable on old Pentium 4 3.06 setups with antiquated Radeon video hardware and modern Core2 Quad and 8800GTX setups alike.
Great for LANs as a wind-down title after the bulk of the gaming is done. I highly recommend this title.