Multiplayer games are OK on PC, we are talking about single player focused PC esclusives like we had in the past and liek consoles have now.
By consoles you mean the PS3(I'm of course discounting the Wii). Good exclusive games on the 360? Dead Rising(one of the best games of this generation), the sequel came to the PC. Alan Wake, it's now on pc and it's the definitive version. Fable series, Fable 3 is now on PC and a better version at that. Halo, Forza and Gears of War then? Gears never went over very well with the PC crowd. Halo was another game that was less than explosive on the pc. The pc driving sim crowd have plenty to deal with, but I would say Forza is the most legit example out of the bunch.
What big new exclusives are on the way for the Xbox? Not many.