Hello,
First, for those who don't know what i mean by "wall attack", i'll introduce it to you very quickly. You're in a PVP map, and there is a wall very closed to your opponent's monument or power wells. A common strategy here is to take the wall and put some archers on it. They will attack your opponent's monument or power well. He'll be in a hard position because it's hard to kill units on a wall.
I admit i use it when i can because it's part of the game. But i think it shouldn't because it's way too much punitive in an off-guard moment. Often, it results by the victory of the wal