I'm not going to pretend this game is perfect. The long tutorial is proof that there's too many gameplay mechanics to keep track of, the controls feel just a bit slower than SRB2 Kart, and there are some awful maps in the rotation.
But not all of the games that I've scored 5 stars are perfect. As a fan of Sonic and kart racers, this the most personal game of my entire life, and I doubt any future game will get me as excited again.