PC's are infinatly more useful, while console fanboys are whining and complaining, and bragging about features (Oh, your Wii and PS3 have browsers?! WIN!) Most of those things have been all thanks to the good old PC. I personally get annoyed when people try to add PC's into the console war. I think we've had enough RTS' to know that we're in a good position (Ignoring pirates who cause more fear than damage), and if we truly wanted to be in your war, we'll wait till you kill each other off, and then move in and steal your flags. I can play the original Prince of Persia on my machine, can any of you play the original Mario Bros.? Oh, you can.... How much more did it cost you? I just use my original copy (Of PoP)... Yeah. Heck, Emulators help you play old DOS games which have trouble with XP. You got XBLA/PSN? I have Steam. I even had to play my FF7 on my laptop because my PS1 decided to stop spinning discs, which I find hard to replace, at least harder then a PC. RRoD? Not here. $100 wi-fi kit for my system? Nah, I'll get the $50 one, thanks though. Oh no, my game library is too big my my HDD, better get a cheaper priced drive of much larger size. WHEEE!
Price is a bit more out the gate, but I have built a darn good gaming rig for people at just over $500, so really, it's not that harsh a deal compared to a 360 or PS3. Oh sure, I'll admit, they aren't as good as my rig, but really, they're well built, and handle quite a bit of the games out there (Crysis isn't as pretty, sure).
Oh, and if you still question the usefulness of a PC as a gaming system, I'll render a few examples:
-Starcraft
-Pretty much any MMO
-Thief series (I like Homeworld as well, personally)
-Good RTS', not those poorly controlled things
-We've had a browser for how long? We also have e-mail, IM's and a heck of a back catalogue of games
-And something I think a lot of people need to use, a spellchecker
Not to mention we get most of the same games consoles get. Though I assume it helps to have a nerd (Like me) as a friend, to build and rebuild a comp. Mice/Keyboards are better than controllers, but you can normally still use controllers too. Oh, sweet, now the Wii can use a keyboard, wow, what will they think of next? Maybe they'll put some form of large storage device, or Digital Video Disc-like object that would let you watch movies!