Maps must have adequate spelling and grammar. Maps must contain a valid author and map name. Maps must contain a proper description of what the map is about.
Maps must be significantly worked on, or entirely created, by their submitter.
Resources should be unique. Largely similar resources, such as icons that are hue-adjusted version of each other, simple reskins that don't change the shape of the model, or maps that are effectively clones of each other, such as most LOAP and Footman Wars maps, may be rejected.