Not that I'm bashing on consoles, but I've seen a far higher fail rate on consoles than "common" PCs (RRoD, graphics failing, HDD failiure, etc). I believe it is because the console manufacturers are intentionally using the cheaper parts so they can sell their systems and make a profit. In a custom built PC you have alot more control over the quality of all of the parts, and you are not interested in selling it at a premium so you end up with inherently higher quality parts most of the time.
Put it this way. If you built a PC for the same it cost to buy a console, the PC would be the better quality product simply because you are not looking for a profit on your own machine. You don't have the benefit of scale, sure, but I always felt...