I've noticed that while in duel mode, the game functions in a relatively responsive manner, dominion and on occasion brawl has some almost crippling issues with client\server interaction. This is of course, my opinion, but I have had many instances of being in a 1v1 situation with an enemy player, only to see an enemy for a brief moment, and with no time to even react, they have 3 slices in, and I'm down on the ground, dead. This seems pretty bad to me, as they had time to run up to me, enter guard mode, and strike me multiple times from their client, while I only saw them appear next to me.