1. Wii backward compatibility
2. Off screen play. Playing my games when the TV is in Use
3. Awesome internet browser is amazing
4. Dual screen local multiplayer is a dream of mine since my kidhood especially with sniper games like black ops 2
5. The best mario Kart ever
6. No silly creepy kids to make creepy comments and breathe heavily into their microphones while I play my games.
7. Exclusive (real exclusive) games that I can't get on my pc and would only feel right on the Wii U
8. The joys of family gaming which I have only succeeded with on the Wii U.
9. I don't have to try and be cool with my Wii U and I own it regardless of what people think or no matter how many people ask "what's that thing". My ps3 was a ps3 and everyone knew it. Nothing special or unusual there.
many more but I listed the above 9 off the top of my head and I don't really want to think anymore.