Lot of potential, could definitely use some tweaks.
-Length was pretty good, although I wouldn't complain if races were a bit shorter
-All bikes should be faster
-The sandstorm mechanic isn't fun
-I feel like traps should be a bit more of an issue, maybe running into them too much can destroy the bike
-Tatooine & Dantooine were pretty straightforwards, Onderon wasn't
-Horizon's Razor is definitely the most enjoyable, although this is probably because the other gangs felt a bit slow to me
-A little more "danger" would be great, maybe running into traps too often will destroy your bike, or maybe make the screamer's flair ability make it temporarily harder to control your bike