The only dvd's I have difficulty with backing up tend to be the occasional xtras disk. Don't know why that should be.

Dwnlding movies is a large topic. There's been many threads about it. Every week in fact.

A decent movie should be 500 MB or more in size. Most have been reduced in size to fit onto a cd. Else they've been broken into a few parts to fit onto a dvd5 format disk. BUT, there's many cheap utilities out there to do the job plus many people who don't have a clue how to do it at t reasonable quality. So with both those factors at hand, yes there's going to be some that are not as good as what they should be. Some people are just too impatient to put the time into learning how to do properly or the time it takes so just do it at min quality for a fast effort. Again, look for the larger ones. mpeg/mpg/avi/avi-divx/avi-3ivx are the best to aim for. Not too many decent wmv files out there. Not full movies anyway.