developing a game for a PC is more difficult since you have to project for future enhancements, let alone keep backwards compatibilty, and then you've got all of the system overhead too, take the X-Box as an example, it's got PC architecture but because there isn't a massive RAM consuming OS DOA3 looks wonderful, console gaming will be the prefered choice of games developers first, and the PC will be second, but of course there are variables such as established user base, online capability etc...