In its current state Rivals is a complete failure because it doesn’t even allow to test your builds/tunes. Thus I have to set up a blueprint for a race, increase the laps and race against Drivatars to test my builds. Of course without the possibility to fine-tune on the fly. You either have to restart or finish the race to adjust parameters. Please bring back class-based Rivals so that ambitious players have a place to test.
The whole multiplayer experience (team adventure???, no choice on class/tracks, no solo races, Rivals) is lackluster to word it politely.