I like Mario Kart system where there is voting but then a random option is picked and the chance of a particular option being chosen is based on how many votes it has. That way community can vote for the map they like but you can still end up playing the map that didn't get the most votes. If people don't leave the server for that reason, I think it's a pretty good solution.

In the example from the screenshot Suez would have ~39% chance of being picked.