I would like that all maps that should get serious consideration for MOTW or other big awards should have a _WORKING_ observer version in the database. Of course it is not needed for first beta version, but as soon as you want some serious playtesting, do one!
Also make sure your melee versions are still playable in UMS, sometimes people host with the "wrong" setting (With this "SC crashes on map preview" bug, it's actually not that bad of an idea :])