I went on steam, just to see, now I'm upgrading my graphics card to play some PC games. Won't replace my Xbox, PS3, Wii and DS, but there may not be another game I'm looking forward to more than Diablo 3.
For the record, I too prefer the Xbox 360 controller for FPS over anything, even KB+M. For me it's better. If you think my opinion and tastes are wrong, you have serious control issues.