So I gave in earlier this week and ended up buying a Wii U. Part of it was the fact I got the system for cheap and the other part is Mario Kart 8 along with the games coming out this year.
The game is just awesome but there were a few disappointments in there.. For battle mode I expected it to have it's own stages instead of using slightly modified tracks (There's a plus and a minus for this, being more 'variety' for multiplayer but since it's timed and the area is only connected in a more or less linear fashion it can be a bit odd).
While I haven't used a Wii Remote for the game yet the gamepad handles just great for both tilt and normal controls <3

There are a few improvements I could think of but the majority of them are minor ones. Being able to have a transparent map in the corner of the big screen would be a plus. Being able to mix and match music from different tracks would be cool but this only comes to mind from Super Smash Bros Brawl.

I'm actually looking forward to seeing if DLC is released for this game since this is one of the few games I'd pay for it :D
Oh also I have SSB4 pre ordered for both 3DS and Wii U plus Hyrule Warriors.

Note me for my Nintendo ID