Great. A lot of good can come from these games. My only fear is these types of games that appeal to the masses will lead to a watering down of more serious games to make them more casual friendly.
From what i understand developing for the 360 is very close to developing for the PC. All games are first design and coded on PCs with development kit and then ported to the respective consoles. So once you get a game running on a PC's simulation you know for sure that the 360 version will match up. For the PS3 there is a greater chance of things getting lost in translation.
Diablo-B's comments