Remove Weapon Mastery (Weapon Camos) progress from PvE (Bot Playlist). An average skilled FPS gamer can now get a Proelium level skin in under an hour of grinding bots. A skilled FPS gamer can do it in 30 minutes (4 matches). Your team mates can be bots too which leads to the 4 enemy bots being easily farmable for difficult Mastery Quests. This is ignoring having to get the weapon to max level before the Weapon Mastery Quests. Something hard such as 75 headshot kills with the Goliath (Revolver) used to be an achievement of learning the weapon, now you can do it in a single match against bots that stand still.