It's not as simple as "add good, remove bad" because many players like some maps while others don't. There's a lot of behind-the-scenes testing that goes into new maps, making sure everything works suitably and that adding it won't affect server performance / other maps, etc.
The point is that we would generally only remove a map if 100% of the players disliked it or it was causing issues with the server, which is usually never the case.
However, if you have suggestions about what we could add and why you think a map would be a good addition, make a thread about it. I believe we added around six new maps and updated some of the existing ones very recently.