I am writing this forum for those who were like me and passed on Wii U. I didn't actually pass on Wii U, I just was waiting for Smash Bros to come out. But, now I really want to buy it. I tried at a retail store. They had a demo of New Super Mario 2 and boy it was thrilling. For the first time my eyes saw Mario in HD and the graphics with the colors were speechles. My jaw just dropped. I wouldn't mind buying a Wii U just to play that game.
I've checked for other games and find out some really interesting games on eShop like lamulana. I find this game to be one the best game on Wii U. It's a 2D puzzle open game much like Catlevania and Metroid. Others like Toki Tori 2 and Mighty Switch Force HD. I am pretty sure there are few more interesting games. The wait is over. I am buying it with NSM2, Scribblenauts, and Lego Undercover with the 3 minis games I mentioned. Can't for Wonderful 101.
Do yourself a favor and try NSM2