The car tiles rarity should actually reflect its value in FH5. They should reflect how you acquire the car. This is my suggestion.
The exclusive playlist cars should read exclusive w/ a gold banner instead of rare w/ blue or common w/green or whatever it is.
The categories should be.
Auto Show - Blue
Wheelspin - Multi Colored
Exclusive - Gold
DLC - Green
Gifted (by PG not players) - Purple
This way the title of the car means something, not just some random word that ultimately means nothing because legendary cars can be worth nothing at auction.