Well you forgot the region code problem the DVD had. At least in the beginning it was really hard to get around this. It's definitely easier if you were in region 1 and only wanted to watch content for this. But in the beginning it was pretty hard to get around that if you were living somewhere else.

I've bought a region 1 DVD (beeing in a region 2 land) and had to reflash my DVD drive to play this DVD. And don't get me started on store bought DVDs which were in English and German, but if you wanted to watch the English version you had to watch it with subtitles.