I'm not sure I understand the logic of the initial post - are you saying that exclusive titles hold the key to success, and holding up past PS3 exclusive titles as evidence of this?
Perhaps you should take a look at the hardware picture - if PS3 exclusives were that strong and held the key to high sales, PS3 wouldn't be in the sales crisis it is.
Incidentally, I'm a PS3/Wii/PC owner, and have no interest in purchasing an Xbox360. Further, I own none of the exclusives mentioned here.
Finally, wrt the point about sales 'spiking' following release of MGS4, it should be pointed out that this is a relative position, and that Wii sales were probably still well above PS3 sales with or without any 'big-hitting' exclusive titles...







