If you’re looking for the next big thing in wacky racing games beyond a capable online framework, don’t look here. If you’re looking for straightforward Mario Kart clone with a glossy Sega veneer, then this game is for you.
Sonic & SEGA All-Star Racing is a great copy of Mario Kart. It's atmosphere is really nice, and you'll love to play this game with your friends. The level design is good enough, and the 60 missions grant a good longevity even in single player.
Though it has some hiccups, unexciting party modes, and a questionable difficulty curve, All-Stars Racing is a respectable effort that makes a good kart racer at its core (and is at least much more cohesive than Sega Superstars Tennis).