I enjoyed the podcast and just wanted to chime in regarding the system selling games like some posters appear to have already been mentioning.
I think Microsoft and Nintendo both have a handful of very big name system sellers but Sony has a lot of good exclusive games that aren't necessarily huge but each have a major draw. I've owned every Sony and Microsoft console since the ps1/xbox forward. (just nintendo/atari before that).
I did buy both xbox systems for the Halo series and I do find the xbox and 360 to be more friendly multiplayer systems. I mean, Halo + four controllers with the system = party. Perhaps this leads to the explosiveness of their titles. My ps3 simply doesn't make me feel like it's a party system. I do play COD Black OPS 2 with several friends but that's hardly an exclusive game.
Sony's exclusives are usually single player games or simply aren't as good as 360 counterparts in the multiplayer aspects. I'll list some for example:
http://en.wikipedia.org/wiki/Category
layStation_3-only_games
Flower
God of War series
Heavy Rain
Infamous 1 & 2
Killzone series
Little Big Planet
Metal Gear Solid 4
Resistance series
Uncharted Series
There are more of course, but these are the heavy hitters that I hear the most about (I know you mentioned some racers that did something for them). Note that nearly all of them focus almost exclusively on single player storylines. I love these games, most of them. I think Sony has the best exclusives in the business where the single player experience is concerned. But do any of these strike you as particularly popular multi-player games? Compared to Halo and Gears of War, for example, certainly not. Sony could really benefit from a big multi-player hit that is exclusive to them. But one absolutely should note that Sony's good(relatively popular) exclusives outnumber the other consoles by a fair margin, despite the lack of multi-player that seems to encourage party events around them.