http://youtu.be/GUvKHFNjx3g

How did this get through nintendo ? and how is it on the most played Wii U games? and how can anyone be enjoying it?

that quality control

There is an audience fot this kind of stuff. There's a large demographic of people who like annoying crap...just because it's annoying. I've seen it when memes run wild around here from time to time. Quality control...who knows. Marketable...absolutely...sadly.

Well, people told Nintendo that they need to be more developer friendly since they were Nazies to indie developers during the wii days and now you have it. This is what you get when Nintendo is freakishly nice to indie devs

For the same reason Paris Hilton and budweiser are popular. Bad taste.

The game is selling and Nintendo gets a cut. I have no problem with it. A fool and their money, or so they say.

I don't think it's one of the most played games. To put it sipmle, I can say very confident that the Wara Wara Plaza as the games with major usage on Miiverse, which btw doesn't imply that it's among the most played games either, because people that don't own the game can comment in the community too.

To be honest though, I have never understood the Wara Wara Plaza's nature. 

This game needs to die.

for each bad game on eshop there exists 10 good games.
So, just skip the bad ones and get the good ones.

HAHA .... this a joke game that you take turn playing with friend. There is a market for game like this one. Reminds me of cat mario.