A major fail, in my opinion, is YouTube TV. The user interface is horrendous. YouTube TV's UI is mostly images (video thumbnails) and it is hard to see what the currently selected item is. A mostly-text UI, with thumbnail only for the currently selected item would have worked much better. I tried to switch to YouTube TV as soon as it launched, but canceled because of the horrible UI. Recently I tried again — surely they would have fixed the issues — but no, navigation is still terrible, so canceled again.
As someone that only uses YTTV to watch sportss, pecifically NFL Redzone, F1, and baseball/basketball playoffs, I really enjoy YTTV interface because it always knows what I'm going to YTTV for. Very rarely do I need to click more than 2 buttons to get to the thing I'm trying to watch