I don't mean to say something bad, but I shall just say this: only the GameCube is glitch-free.
Anyways, all console-wars aside, the Xbox looks like a major dust-collector to me, though probably not as bad as the PS2. Just like with any computer, you should open up the box now and then and dust it out with a can of pressurized air.
Of course, you could just go purchase one of those CD cleaner thingies, that's basically a CD with brushes on it, but I don't trust those. I'd think those would make it worse by scratching the lens. You should just open up the box and wipe of the lens and the general CD area.