ExtremeTech has posted this scathing review of the 360's DVD playback, going so far as to say that it renders some movies entirely unwatchable:

Frankly, the Xbox 360 is a terrible DVD player. Yeah, we know it's primarily a game console. We know DVD movie playback is essentially a "free" feature. But it is a feature nonetheless, and an important one. After all, many of our TVs only have so many inputs, and we only have so much room for boxes in our TV cabinets or stands. If you have an Xbox 360, you have no reason to believe that you shouldn't be able to use it as your primary DVD player. Except that you can't, because it's awful. Honestly, we have seen sub-$100 DVD players and PC graphics cards perform better than this.

It's an interesting read and there's lots of pictures that show pretty clearly how flawed the Xbox DVD playback is. My question is: does anyone even use their 360 to play DVDs? Before picture quality could even be an issue to me I'd have to get over the fact that the 360 spinning a DVD sounds like a jet taking off in my backyard.