I will tell you why PC gaming looses people to consoles
1) PC gaming is complicated. Every game may or may not work perfectly on your computer and you have to dink around with performance options to find settings where the game runs (if at all) properly on your machine.
2) PC gaming is designed for Keyboard + Mouse which are great for certain genre that evolved with such setup in mind, but terrible for many types of games designed with console controllers in mind. Easy example is fighting and action games. Sure you can get a controller... but this takes things back to point #1 which is PC gaming is complicated. Not all controllers work in all games. You might be using third party software like Xpadder to map keys, etc.
3) Local multiplayer support is nearly non-existent.
4) PC gaming is expensive. Sure the games are cheap due to Steam, but new games cost about the same and the hardware requirements to play Battlefield 3 on PC optimally are waaay higher than it costs to just play the game on X360 or PS3 for $60 + $250 for console. Just the mid-range graphic card for PC might be $200. The Display for PC can be used for console and vice versa so no cost disparity on display.
5) Console exclusive games don't come to PC at all (for instance from Nintendo or Sony) are are some of the best games created.
I am multi-console and don't ignore PC either... if my PC can play a decent game for it, I will. Rest of my gaming generally on consoles.
