If you like those sort of games get it! You should be able to find it for $300 over the holidays with a 3 game bundle, my friend got one a few weeks ago.
Personally I love everything about the Wii U. The games are built for me. Not saying I don't like games on other consoles because I do, all of them are fantastic in their own right, I just don't have the time or money to have more than 1 at a time (2 tops if I get a really good deal).
There are plenty of fun exclusives to get, and a lot of great local multiplayer titles which will help convincing your wife to game even easier. I would recommend for sure.