The game is short in the way any really good book is 'short', if you really enjoy it when you get to the end you wish it wasn't over just yet.
Captain Toad's Treasure Tracker is great and is appropriately priced, anyone saying otherwise either hasn't played it or has a very strange sense of value, 8-10hrs is plenty. Because it's good, of course I'd like it to be longer so I can enjoy it more and I'd like it to be cheaper so more people can enjoy it like I have. I could say the same for many other good games as well though.
p.s. Your poll is no good, if you don't care to give people reasonable options and want to skew the results to your preferred conclusion, you really shouldn't bother. i.e. there should be an option to say 'No, the game is priced correctly'.
