Well DVDs look pretty crappy on my 20" Apple Cinema Desplay. I believe it's because of the pixelly/sharpness of the LCD vs. CRT. You just have to sit back a few feet. If you were to run the DVD at 'actual size' it would look great.(But why would you, it would be tiny)
I'm not a huge fan of LCDs at this point. For something like DVDs, CRTs blow them away. (But hey, just my opinion)