Is the 360 to the PS3 what the PS2 is to the Wii?

[Rainbird]

In some ways, yes.
But the budget of the game as well, a multiplat game has to be designed to fit on the DVD of a 360, but this isn't a favorable way to build a game for the blu-ray, but developers can't afford to redo the way the game is put on to the disc. Or rather, it's not worth the investment.