There is a thin edge between average-hard and hard maps, you can get it when getting better with your skillcap, it is not the same as h-x and x, but you can get the same understanding when you skillcap getting higher, why are they on the hard or extreme server. Try to compare hama_bama and synergy_x , 8b1_helinashop and fu_plainhop, you have that feeling when you play them that they are on the level where are they should be. Average server is first of all for all novice players which should play with comfort, hard server for players who know something and extreme for players who knows what are they doing in all movements