People are overestimating R2 by a longshot. It's not even the big FPS on the PS3...that's Killzone 2..R2 will struggle to hit 1 million anytime soon, it will be heavily overshadowed by COD during the winter even on PS3...It won't go near COD4(ps3 sales only) sales. Gears 2 is the 2nd biggest 360 exclusive, comparing sales is stupid, regardless of userbase. Plus who cares if R2 is a FPS? not all FPS are gauranteed good sales...look at Far cry ,
I wouldn't be surprised more PS3 owners buying LBP over R2 during the xmas period.