Duration caps on crowd control abilities such as can’t attack/move. Making their removal dependent on the very things they prevent allows them to last the entire fight. I would recommend 2-3 round max durations.
Remove any mechanic that is either bugged or intended to randomly one shot everyone on the opposing team until fixed. The ranger’s legendary bow proc comes to mind.
Add. A. Forfeit. Option.
Add. A. Skip. Turn.
Enforce the initiative in pvp, don’t change to a turn per team all of a sudden.
Point loss against higher ranked/leveled opponents should be reduced greatly. Losing 25-30 points from a team you had no chance of beating is not an experience that encourages play.
Please feel free to add to this post CONSTRUCTIVE criticisms that can genuinely improve the game.