strange you seem to think GRAW went back to the 'RB6 style' and that you preferred GR2 over [GR]...if anything, GR2 was the most similar to the rainbow six (xbox) series, [GR] was a slower paced, more tactical game. GRAW on the 360 at least is a nice throwback to the old, slower paced tactical days of [GR], cant speak much for the xbox version though, I would have waited to get the 360 vers.
I personally think it's all about how you approach the game, if you run and gun...you'll do it wherever you can, if you like a slower paced game, you'll use that style. I only really play no respawn siege and take a sniper pretty much every round