Lack of actual shotgun nerf, Supers that kill through cover, spawn camping snipers, sticky grenades bouncing off enemies, aim assist tracking fails, collision detection fails resulting in unexplained physics-related deaths, more collisions fails when attempting to splatter someone with a vehicle, lack of skill based matchmaking, people who think Icebreaker is a PVP weapon, how weak Thorn is, how Flame Shield doesn't always proc on a melee hit, how Viking Funeral doesn't actually increase damage- only duration, how Sunsinger Super kills do not contribute to PVP Super kill bounty, how useless Hunter stealth actually is, how terrible the loot system is for post match rewards. That's all I can think of for now, but I'm sure there is more.