This thread was placed in the discussion forum rather than the mapping thread because I felt here was more appropriate, this is a question of AoS game-play rather than the discussion of ideas and opinions. If it is in the wrong place would the mods kindly move it.
As stated in the title; what makes a good map?
In my own eyes it has to allow multiple methods of reaching the enemy base, unlike many single route maps than end in a boring game of attrition. Custom maps such as New Fort illustrate this quite well; there are three main routes to the enemy's fort, each fighting independently but giving a strategic advantage to the others.