Well, consoles are "good" because they're easy. You buy one in the store (games often come with it, even), you plug it in and you start playing. No installations, no complications, less or no weird errors (stupid windows), ...
Computers, on the other hand, are more cumbersome. They need maintenance, upgrades and -dates, repairs... But in return, I feel computers offer a better gaming experience. RTS or FPS games simply aren't that good on consoles. And PC's offer better graphics.
Another thing: pc's allow more variation. Many games offer mods, additional storylines, new textures and whatnot. And warez, of course
