A few comments:
R&C - I don't know exactly why the sales are so poor but it deserves better. It's by far the best unique PS3 offering so far. Nothing on 360 like it.
PG4 - It's all been said but it's been my experience that PGR is a pretty hardcore demographic game anyway. It was released too close to Forza and amongst a flood of quality software titles in numbers that are rarely seen. I mean, if somebody is going to buy 1 game, most will buy H3, not PGR4. I think PGR3 did well mainly due to it's launch game status.
PS3 3rd Parties - Hope I don't get banned for saying so but Sony will have to hand out MASSIVE moneyhats to make it worth it for 3rd parties to be TRULY PS3 exclusive. I mean, If I'm Hideo Kojima and I'm looking at these figures, I know what I'd be thinking. IF MGS4 were released simultaneously on both platforms, I wonder what the sales figures would be like. IMO the US X360 fanbase would eat it up. It'll sell well to PS3 owners too but the difference in install base is so staggering at this point, how much money would Sony have to pay to make it worthwhile? (Although the money was probably agreed on long ago, I wonder if anyone has regrets?)
Not bashing anything, just positing some logical thoughts. I like my PS3.