ME3 will be the first time the franchise is released day and date with the 360 version. Twisted Metal is a relic franchise from the 90's. Resistance just isn't a good franchise imho. Plus, the realistic FPS is what's big these days. Sci-Fi has taken a back seat.
Aside from that, I don't know what to say. Some franchises do sell better on the PS3 than the 360 despite the huge difference in userbase. Oh, and the PS3 IS a hell of a Blu Ray player.