Let's prove a lot of the "arguments" for consoles being better wrong, shall we? Stop using them.
Controller is more comfortable/better than mouse Even if that were true (it's not in the case of a lot of game styles), you can use any console controller with a PC. Not only PS3, Wii, and Xbox, but also third party controllers and you can program your own buttons.
The PC controls better than the console. That's not an opinion, it's a fact. Since all the control options available for console are also available for PC plus more, it.
I can play from my couch and relax while using a console You can do the exact same with a PC. I don't know where people got the idea that you have to sit a desk to use your PC, you don't. I hook my PC up to my projection screen all the time. I think grab my 360 controller and sit on the couch to play some games. It's exactly like a console, except it performs better and looks 1000x nicer.
Console has more games Not even close to true. RTS, MMOs, most simulations, etc. they're all pretty much exclusively PC. Plus most AAA titles released on console are also released on PC. Then you have indie games, mods, emulation, etc.
Consoles are cheaper Considering most households with a console also already have a PC, the cost to get it gaming ready(if it's not already) would more than likely be less than a console. If you have a PC even relatively modern (3-4 years old) you'll just have to spend $100-$200 for a video card and you'll be good.
Plus it is possible to build an entirely new gaming machine for $300 that will run games at the same quality, if not better than consoles. I did it earlier in the thread. With links and everything.
So there's the major ones that keep being used, yet aren't true. The only arguments that are left have to do with people not knowing how to use a PC properly. No one under the age of 30 should have trouble gaming on a PC. It's not hard at all. It's amazing that the only people who claim it to be difficult are the people who don't ever game on a PC. So how exactly would they know?