I don`t think the comparison is really fair to Wii U.
Although Wii U`s situation in mainly Nintendo`s fault, can´t overlook how different GC`s situation was at the time.
Basically, it sold 468k on a 149$ price point and a catalog of 1st/2nd party and 3rd party exclusive releases that puts Wii U to shame.
Not to mention the momentum that Wii U completely lost this year and the brand confusion.
Given all that, Wii U couldn`t do much better than it did this November.
Again, basically, Nintendo`s errors determined this outcome.