IceMyth :
The problem with the game, 1st it rated 2-2.5 on AppStore. 2nd they charge you 14$ if you want to continue playing after 3 levels. 3rd, (speculation) more levels will be released and if you need to play them you wil have to buy them separately -> tons of $$.
Also from what I read the ticket things to race vs your friends you will need to buy them (You get some free but if you want to play more you will have to buy them).
Almost everything you just posted is wrong.
It's $10, not $14. And no other micros-transactions or fees exist. Rally Tickets are earned or traded for, not bought. New levels also won't cost anything extra but they have no plans for new levels yet anyway.
One more thing, many of the low ratings are from people that have never bought anything on the App Store and are knocking Nintendo for their unfamiliarity of buying an app (regardless of price). This means they've tapped a market that normally doesn't even play games....again.