The REAL problem is, the people are too lazy to download the new maps, and therefore the servers only run the default. Only smart people will put up custom. If you look, EVERY server runs default maps (except like 5) and if you look real hard, you can vote them but its very rare because most dont have them. Why? Because people dont check the forums, and therefore the download SHOULD come with the custom maps... When you DL trem, u only get like 10 maps, instead of the 30-40 that are out there... (Common Custom Maps)
Ex; Ive never played Metro, but thats cuz no frikin server has it or people reject the votes... So sadly... Thats the problem, i hope in 1.2 the custom maps are added...
My idea = Add a Custom Map Launcher that Downloads / updates old maps with new ones from tremulous data base thats submitted by mappers... This would indeed, be a great Updater!