I understand the pacing between arcade matches needs to be relatively fast, but arbitrarily slapping 'liked' or 'disliked' doesn't help anyone.
Instead like 30 seconds to fill out a brief survey about the important qualities of the map would be better. There could probably be more
Flow
Balance
Spawns
Lighting
Complexity
Detail
Fun
These would be rated 1-10 and would appear one at a time in the current fashion we have the 'liked' or 'disliked'
The overall rating of the map would be the average of all those qualities, with the greater detailed breakdown being available to the publisher of the map. I know this isn't the ideal solution, and it is a bit bulky. However, it's imperative that a greater level of detail for feedback be available for content creators so that they can improve and understand a little better why their map was a hit or flop.
I imagine a decent number of people get discouraged when they spend a few hours (which may be a lot of time for a novice map maker) building their map only to have it pummeled into the ground without knowing why.