Finally bought Rainbow Six:Vegas for cheap, finished the game.
Don't really know what to say, except that it plays closer to Modern Warfare 2 than Rainbow Six (haven't played the R6 games since Rogue Spear). It's good, but it's nothing like the old screw-up-just-once-you-die R6 I've been accustomed to. The only major plus in this game is that I don't have to suffer through a bad plan--in the old R6 and Rogue Spear, if your plan didn't go very well, you had to either abort, or stick to the plan--you can't change it on the fly. On the other hand, I also sort of miss the planning stages, because you could play R6 as a Tactical game instead of an FPS (by opting not to control a character). I.E. you had two ways to play the old games. Both were pretty cerebral (and unforgiving).
The Vegas series is more along the lines of standard regen-health FPS. In itself, not a bad thing, and I will go and buy Vegas 2, but...this just isn't the same Rainbow Six I used to mess up my Duke Nukem 3D-loving friends with back in the day...