and made it more of a third person shooter than a strategy game that the first Ghost Recon was.
I recalled reading that Ubisoft took some initiative to actually make the game more PC-like, rather then a usual console port like near every other game they make, and apparently they made GR:AW an FPS only, no 3rd-person and what not, and added in some extra maneuvers to make for lack of 3rd-person.
(like peeking around corners, as well as adjusting level design to suit the FPS perspective better)
Regarding speed, no clue here, have yet to try the demo, but I take it near every 360 port at this point will require a beast of a PC to run.
(like Oblivion)