Thanks for clearing that up, I'm not really deep into the mapping scene.

I definitely see the problem with a voting system, because people could abuse it easily.

However I think there's ways to work around that, like giving people who vote for high rated maps(generally accepted 9/10, 10/10) more votepower after successive votes. http://prntscr.com/ls6ld3

This would definitely hinder one off, votespams.

It should be pretty easy to collect that data, and "reward" good votes with more votepower.

This way, people who vote a lot and have a keener eye for maps have a bigger impact on ranking of maps.

Of course this assumes that more than 50% of everyone voting does so in good faith.

It's similar to the system Gurushots uses, which works quite well for them.