I'll just share the same ancedotal experience I share in all of these threads: I played PS3 and 360 exclusively for years, built a gaming PC last fall, and now that's all I play. I use the same TV, chair, and controller, but all my games look noticeably better. The mouse and keyboard function infinitely better for shooters and most rpgs. I don't even play strategy or MMO games, but they're obvious about a thousand times better on a PC. Through Steam and other digital distribution platforms, I've got a massive library for a fraction of what you'd pay on a console.
The only downside to the PC? I've got six fans, so my machine hums a bit. I cancel that out with a quality headset. Otherwise, I see no reason to play my PS3 or 360 other than the rare exclusive. Then again, I'm in my late 20s and employed, so I've got the disposable income to assemble a pretty decent setup. That wasn't the case when I was younger, so I got down on consoles. What did I do when some "pc elitist" talked smack? I ignored him. I definitely didn't argue with him, though, because I would have been wrong.