Metal Gear Solid 4is supposed to be one of the smokin guns of PS3 exclusives, in a time where almost zero games are (or remain) platform exclusive. So many games are cross-platform or "timed" exclusives (how I hate the corporate BS that goes on behind the scenes here) now that you aren't really missing out on a whole lot by only owning one console (and I'm talking either PS3 or 360 here, of course). Myself being a PS3 fan, though I own and like both consoles, I was really hoping to be like 'well, but we have THIS', referring to MGS4 of course. And, MGS4 did sell a whole hell of a lot of PS3's here and in Japan.
However, I think MGS4 is an embarrassment to games.