I'm not remembering people having this trouble with the Wii. Or the Wii-U, for that matter.
Soooo...
What happened, Nintendo? Manufacturing error? Design flaw? Trying to push a little too much technology into a device small enough to click into place next to the screen, was usable as an independent controller, and could count virtual ice-cubes and/or recognize hand gestures?
...Assumed everyone was going to buy the add-on version of the controller hardware anyway?
This may not be fatal- I don't know how much of the early-adopter market is having this problem- but it's enough to raise headlines (and eyebrows), and it doesn't look good. This is not the time to be sending out "you're doing it wrong" lists- this is the time to be offering to fix it for anyone who is having the problem, for free.