Sonic Riders game, Zero Gravity, has a feature that we think is great: online rankings. That's something we've asked for in more Wii games (specifically VC games, but we'll take it in anything), and we think it's a nice way for people who ... like to compete to do so.
We could also see lag being a big-time problem in a racing game, especially one that uses wireless connections only for Internet play. Rankings sidestep that issue nicely. Good job, Sega! Keep showing us evidence that work is being done on this game! With the game due out in January, there's still plenty of time to add new stuff-- like graphics.