Very good. Just like NFS/Mario Kart
The best bit was when Diddy Kong sets alight. Serves the little bastard right. So annoying when he beats you on Mario Kart Wii! GRRRRR! You did the right, Mario. I also like the bit when Luigi throws the shell. He looks sooooooo angry! Overall, a great animation, and a nice way to make yourself chuckle.