I have been a UMS mapper for a couple of years.
Doodads are lame and get in the way.
Teaming up with computer players is fun.
Playing as terran, zerg and protoss at the same time is fun (600 unit limit is better than 200).
While I don't mind the odd multiplayer with my brother over LAN, I don't like playing over the Internet because other people who do are obsessed with winning and not playing.
I am from Australia, but I don't ride a kangaroo to work.
Doodads aren't lame, they add artistic touches to maps. They can also add more elements of stratagy (hiding behind trees, etc.)