Between yesterday and today I have played Summit West 9 times and Precinct West 7 times the only other maps I got was Summit East twice, Farmhouse east once, Crossing once, and hideout East once.
When less than 20 people are playing, it tends to just put you right back in the map you played last round, or just one other map.
Would be nice if there was a way to make it so the same maps don't pop up over and over again.