Resistance probably sold loads because it was one of the first games out, and because the PS3 was hyped so much at launch, everyone that bought a PS3 picked up this game. Doesn't mean it was better than Halo or whatever, because you never know, people may not like the game so much after playing, so Resistance 2 for example could sell much less.
Remember, I'm no fan boy because I now have both consoles...
Anyway, please, can we stop this turning into a flame war?
I do have to admit, when I powered up the PS3 for the first time and started using it yesterday, I was more impressed with the layout and how it worked than I was when I first powered up the 360. Its a lot quieter too.
Theres something special about it, thats for sure.