I play coop at times with local friend here in Australia. Ping is listed as 21ms.
There is constant laggy behaviour using some skills such as the thunder hammer movement skill. It rubber bands back from the target about half the distance and lays the damage on the ground before teleporting you back to the target.
Still also having on occasion the bug where a player in group will lose ability to control their character however will not drop from the game. To resolve this they have to alt-tab and close the game (not exit) and then relog to "rejoin multiplayer game".
Something is absolutely screwy in your netcode.