Have you really played Sonic Riders 2? The game is fantastic!
It's well designed, original, nice sounds, nice tracks and completely fun! It also has more "Sega factor" than SASAR. The gravity system is extremely fun and the shortcuts are ways better than the ones on SASAR.
It has Hang-On machine, Hang-On sounds, it has KUNOICHI!! And look, this is a Sonic game! Shame on SUMO and Sega for not bring more contents to SASAR.
Don't need to talk about the "gimmicks"... well, the gimmicks are extremely better on Sonic Riders 2 and works fine. It has a lot of them!
It has also a story mode, with events and incredible CG movies!
SASAR is not a bad game, I like it, but it's worse than Sonic Riders 2.
And who said I dislike OutRun? Probably Daytona and OutRun are the only "race" games I can play and enjoy. The rest, like Gran Turismo, are just boring...