This is what has been said over and over again. The PS3 is much more complex to program for and the only thing that is going to show what the console is truly capable of are first party exclusives. Sony really did completely forget what the point of a console was with this generation. Had the focused on gaming and not house brand processors and blu-ray they might not be falling so far behind.
Gameinformer this month has him stating the total system power gives them more to work with as well as the blu-ray advantages(2 disc Rage, 3 disc Doom 4). Other devs have also said it being easy to work with the system once you get used to the different(not hard) way of programming for it. All third party games are now trading blows in terms of performance and visuals. Obviously someone like him prefers a PC style approach considering his background.
I love my PS3 but it was a bad idea to go so crazy with the technology and make it hard to program for. I was #1 with Nintendo since the original NES came out(Gamecube and PS2 were a tie probably) but I gave up on them with the Wii, its not how I wanna play. PS3 is #1 with me.
Personally I don't really feel that the Wii is a X-gen console. I would say that it is current gen in the fact that it is currently being sold but it is more along the lines of the PS2 than it is the Xbox 360/PS3. It only fits in with them the same way that the DS or PS2 does in that they are all game systems. So lumping the Wii with them is like saying that PS2 has won the war because it has sold more consoles that all other consoles combined at something like 150 million and still selling pretty good.
The PS3 helped Sony win the HI Def war but in the process lost the game console war. All the future royalties from blu ray may offset their losses this time around in the game market. They will probably bounce back with the PS4 since their sole focus will be on gaming next time around.