Even if you disagree with it I think there is a common perception now that the wii u like the earlier wii is a generation behind in technology and performance. It's generation is not important, its performance level is. Despite how nice Mario kart looks the wii has a huge number of games that are inferior to ps3 and 360 versions of the same games.
I've been a wii u owner from launch and can directly compare to 360 and PS3 and to me the older consoles have a greater range of technically more impressive games. That may change of course.
Wasn't this also the case with the original wii anyway. Despite the wii's success it didn't get the games that ps3 and 360 got most of the time and when it did they were rubbish because of the weakness of the hardware. The wii only really sold on its exclusive games. Can you imagine going into a shop owning 360, PS3 and wii and saying 'I want to purchase call of duty for wii instead of 360 or PS3? So the wii was the winner in hardware sales but was actually not very important for big budget multiformat titles despite its success. The wii u is a flop and has weak hardware so is even less important this generation.
