I bought one exclusively for MH3U, am enjoying Kirby (Currently $0.30 on the eShop), and looking forward to grabbing Super Metroid for the same price, but I would not recommend buying a Wii U unless there are enough games out right now that you want to play as soon as possible. I am just too crazy about MH to not do it. Took me a couple months, but I got there. I've done the same thing for the PSP in the past. In fact, the only non MH game for PSP I have played is Valkyria Chronicles.
Definitely wait for holiday or until a few games you want come out.