Could be great but....
$10 would be a great price for this game, if it was not an in-app purchase. I think that is the problem every one has with the price. Not how much it is, but that it is an IAP. Fix that Nintendo and you will get better reviews.
Update:
Nintendo is still showing its greed. I would pay $10 for it, but not as an IAP. This is how Nintendo keeps you from installing it on more than one device with out you paying for it multiple times.
Update:
Still needs to fix IAP problem.
Detritus22 about
SUPER MARIO RUN, v2.1.1