Downloaded it yesterday, but didn't get around to actually playing it until today. I think it's a great game, and pretty much what I expected it to be based on the pre release video. I do think I would like it better if it was not a runner, but it is what it is. It's worth the $10 for me, and I hope that Nintendo releases more games in the future.
On a final note, I think it is ridiculous and sad to see so many people leave one star rating for this game on the App Store because of the price. If you don't like the price, fine. Or, if there are things you don't like about the game, fine. But there is no way that this is one star material.