PC is great for doing videos and streaming, better graphics, and a smoother gameplay experience. Being able to setup multiple monitors for games can be useful/cool and being able to play your own music with games is awesome. Yes, you can do that on Xbox360 and with some games on PS3, but that doesn't apply to all games or with the Wii and doesn't allow for the same flexibility with setting up stuff like crossfading or pitch/tempo changing. Though you can just run your audio output from your TV though to your pc for your consoles depending on your set up (it's what I do).
PC users usually do update more frequently than console typically unless you spend a decent amount of money future proofing your rig. The PS3 came out in 2006 and every game that's come out since then is playable on it and will continue to be whereas I don't know anyone with a PC from 06' that can play some of the games we have today on PC without any issues.
I don't like PC controls for certain games but a controller fixes that. That's not a huge deal since there's plenty of gamepads you can use with PC (you can even use XBOX, PS3 and Wii Controls on PC if you prefer them).
Maintenance is also an issue for PCs whereas with consoles most people never bother cleaning dust or have to run defrags, it's not hard to grab a can of compressed air and go to town and set up your defrags/virus scans to run when you are asleep or out. It's something to keep in mind if you don't know much about computers and have never built one before but it's not even hard to do. As long as you keep your PC cool and clean, PC gaming is superb.
Now if we are talking about things from a perspective of being practical, I don't see why you'd spend 900-1000$ on a PC just to get a 10-15% increase in visuals and performance when you have a console that will handle the same game just fine, especially if your sole concern is just enjoying the game and getting a few hours of entertainment out of it and/or not really concerned with graphics and slight drops in FPS here and there.
A PC is worth it if you plan on going all out for gaming and want to get the absolute best experience possible with the most amount of freedom and do heavy online gaming. Consoles are great if you have friends over a lot or travel a lot and like to have access to some gaming. Anyone here ever do hotel parties or set up a flatscreen and a console at your college and have impromptu tourneys*? It's a lot easier to do with consoles since they are easier to carry around and set up for that.
PC Users have Steam for Achievements btw.
*This guy has







