It's funny to me that the MPAA has the time and resources for a code review on 3rd party code but still has yet to build an app that allows me to pay for streaming their content.
Convenience really is my big issue; Steam has proven it's true for others too. It's much quicker to get a movie via tpb or where ever, than to go hunting around the few remaining video stores or try to find any legit place online (especially if it's a foreign film or an obscure 70's one).
The other annoying thing is Youtube take-downs. There have been so many times where I wanted to show a clip of some show/movie to a friend and then couldn't find it on Youtube anymore :(.