This was so much fun! All of the races were enjoyable, and it was great to see some of the older zones I haven't been to in a while.
I think my only complaint is that the event doesn't award enough of the Riders of Azeroth badges to purchase all of the cosmetics provided (you can get up to 154 but need 240 to buy everything). Assuming they continue to add new cosmetics when the other continents' races arrive, the only way to get all of the cosmetics is to do the races again on an alt.