FF13-2 is a sequel not a spin off.
its irrelevant, since ME2s sales are already above those of FF13-2. and ME3 is going to launch similtaneously for the PS3 and the 360. no chance FF13-2, FF13-3 will outsell those games. maybe Versus wont either.
it was also unfair for the OP to compare a relatively new RPG to a well established JRPG. could the OP explain why Skyrim has sold 10 mil copies compared to FF13s (however many copies). Mass Effect 2 (and soon 3) have sold more than FF13-2.








