Not going to read the entire thread, but I think it's a combination of reasons rather than just the single-minded reasons people were giving in the first few posts.
The name is potential for one of the reasons the Wii U isn't doing that well, but definitely doesn't explain the extent of it.
The perception of the price to value could be another one, especially given the PS4 is $400. Since Wii U hasn't produced as many mass-appealing games with variety, it also hasn't been getting the investment value going for it too strongly either.
Advertisement for Wii U wasn't strong enough. This is definitely a legitimate argument as the Wii U didn't see as much advertising at it probably would have needed to get its name out there and known as a separate system to the Wii.
Then there's the problem with 3rd party relations. If Nintendo was on better terms with 3rd parties, the system would have more competent 3rd party games than what they do have now.
I'm sure there are more reasons, but to what extent how much each one influenced the poor sales of the Wii U is really anyone's guess.
However, the reasons I gave do pretty much point it to being Nintendo's fault. Personally, I think that going around saying who's fault it is doesn't solve anything as long as Nintendo isn't aware of where the problem lies.
