It's not just the performance that makes PC games my favorite, it's really the depth of substance. PC just lends itself to a much deeper gaming experience. Game design is not limited to a controller and minimal hard drive commitment. Consoles are really limited to rudimentary depth and arcade-like play for the most part because of the interface. You can build a gaming PC for a little more than a console and be just fine if money is a concern and still enjoy the real benefit of what PC gaming has to offer. You don't have to build the world's fastest gaming rig to have fun. The complexity of a huge persistent world sandbox experience, or in-depth role playing experience just can't be matched on anything other than PC.
Some will say, 'well look at games like Skyrim, available on xbox etc...' True. The game content is virtually the same, but on the PC we have infinite user-created content which allows for the ultimate in creative expression, replayability, and even performance, graphical, and user interface enhancements. My first gaming experience was on PC, and I've owned consoles as well, from NES, SNES, Sega Genesis, up to Xbox 360, but none have every captured the wonder and imagination I've gotten to experience through PC gaming. /end nerd rant