Transformed has reigned supreme so far. And it continues to reign supreme in single mode. Overall, however, Crossworlds has managed to match the score and in terms of fun, it is a very good game. This is proven by the player reviews on Steam and here. The same cannot be said about Mario Kart. Mario is overrated by "professional" reviewers, while Sonic is underrated. But that's how it's always been. Nothing new.
Sega has delivered a more than worthy sequel to this legendary series. The gameplay combined with the art and music makes this game exceptional. I wish you strong nerves with hardcore levels. Welcome back Joe Musashi!