I got a 360 for the strong WRPG line-up, which back then consisted out of Oblivion and Mass Effect as exclusives. I don't regret my decision as Oblivion wasn't released on the PS3 for one year, Mass Effect stayed console exclusive and along came Fable 2, Divinity 2, Two Worlds, temporarily exclusive Fallout 3 content, etc.
So the fact that Microsoft is bleeding exclusives doesnt bother me as Sony's exclusives dont interest me. But if Sony comes up with one or two good WRPG to combat Fable then Microsoft will lose a costumer. Because I don't regret buying my 360 but I can understand why new consumers would pick a PS3 over a 360.