By default newly published maps are placed into Pending category which can be accessed when creating a new server:
NOTE: Only registered members can access Pending Maps category.
In the Pending category, the default 5 stars rating is replaced with Rating points.
New maps need to reach 100 points to be approved. On the other hand, an update for the existing map only need to reach 50 points.
How are the points added?
When you join a custom map you will see 5 stars at the top left corner of the scoreboard
Each rating have a different point value:
5 stars = +10 points if you have over 5000XP | +7 points if you have less than 5000XP but more than 1000XP | 0 points if you have less than 1000XP
4 stars = +7points if you have over 5000XP | +4 points if you have less than 5000XP but more than 1000XP | 0 points if you have less than 1000XP
3 stars = +2points if you have over 5000XP | +1 point if you have less than 5000XP but more than 1000XP | 0 points if you have less than 1000XP
2 stars = -7points if you have over 5000XP | -4 point if you have less than 5000XP but more than 1000XP | 0 points if you have less than 1000XP
1 star = -10 points if you have over 5000XP | -7 points if you have less than 5000XP but more than 1000XP | 0 points if you have less than 1000XP
Basically, vote 3 - 5 stars if the map is good and you want to see it in the game or vote 1 - 2 stars if you think the map is too simple or the quality is not good enough.
If the map reaches -20 points it is deactivated.