Igor clearly lots of people disagree with you. Every other game players leave after map selection. Which is the core of the problem. Maybe you can be constructive and come up with solutions, rather than insisting that because you're happy, then other people shouldn't have a problem. It's very normal for games to have map preferences.
Once again, the mechanism wouldn't add any extra queue time. Programmatically, the prefences can exclude or weight the map selection, users wouldn't notice anything except their choices being taken into account, and less people leaving after map selection. Which is the main point.