Smurf Leveling
There needs to be a separate area for people to grind out levels... too many bots (on the 'human' side) in coop vs AI + too many smurfs in norms for new players to enjoy the game as they level.
Something like 105% XP area that is listed as level up that requires confirming account with another lvl 30 acc as 2nd. Could then punish both accs easily if someone is trolling.