I heard they cam be a bit laggy. They struggled getting framerates up along with ps3 quality graphics on the wii u hardware.
Id like to get one to see how well it takes advantage of the gamepad, but if there are major graphical issues its not worth it.
Im actually considering madden 13, even though i dont really play sports games because it really takes advantage of the new controller. Its one with some lag issues though, according to reviews.