On one hand:
- fun premise
- whacky car designs
- fun characters, especially the girls
- good pacing
- old school charm
- good choreography for non-car fights
On the other hand, Appare-Ranman is VERY style over substance, there's literally nothing there beyond the surface level and even the whacky premise isn't made full use of.
It's an ok time waster if you don't want anything deep and like the idea of an anime cannonball run, it's literally just Anime Cannonball Run, nothing more, nothing less.