If there was one thing botched by every console company this gen, its a UI/OS that isn't bloated or convoluted to navigate. Microsoft is hopefully going to redo the Xbone one completely, Sony is going to coast on minimal effort like last gen. Wii-U's OS is alright but offers no customization whatsoever.
People thought the idea of 16GB's of ram being in these consoles was a dicey idea, but the Xbone and PS4 use way to much ram for their shit OSes, which in turn means games have to use baby amounts of ram. Nintendo using Android is a smart decision depending on what they want to release on their next thing,