I like the fact that I can play my game and not interrupt whoever is watching something on tv or vise versa. Then there is no fighting over who gets to use the tv.
I pretty much think that like it is now with the GameCube, people will in the future talk fondly of the Wii U. I enjoyed what it tried to do with the dual screen. Star Fox Zero is kind of a unique experience using both screens to fight the bosses. I also enjoyed some of the games that came out for it like Splatoon.