I have
but I'm just used to PC games looking so sharp, I mean a given title on PC @ 1900 with 4xAA looks amazing compared to a 600 or 720p console varient
I have to caveat all of this ... all multiplayer games I play on the 360
I also have a PS3 and a Wii, so I'm no fan-boy - I just want my cake and eat it
perhaps its more noticeable as I play most of my games on a 24 inch Dell monitor - so I'm close up - as I prefer playing (even console games) games on that vs my 42 inch Plasma as I just prefer a smaller but closer screen.