1) Balancing rounds/lobby
Even though the game appears to be 'balancing the lobby', I seem to always end up with a situation like level 5,9,11 vs lvl 17,31,36 (these numbers are from an actual round and are rather typical)
2) Assignments/missions that are impossible
I frequently get assignments/missions that I don't have the unlocks to complete; consider making missions relevant to a player's level/unlock status instead of giving the player assigments with a gun they don't have access to.
3) When reentering the world map, I will constantly be brought back to the same unplayable continent and district even though I've played the last 8 games on a different continent and district, forcing me to press back and then go over to re-select the continent that I'm playing on. When entering the world map and/or leaving a game review screen, take me back to the district that I just fought for, not an irrelevant one.
4) Balancing weapons - this is ongoing in most games, but some feedback from the beta follow:
Teleport needs a longer time where the player is vulnerable to attack otherwise the players with teleport/shotgun just run around instant killing anyone at any time with no chance of self defense on the other players part. As soon as the teleport effect pops up, I frequently unload an entire magazine into it and never kill anyone before they get off two shots from the double barrel.
Preyon needs less life points, I've run away from them numerous times while unloading two full clips into it and I've never seen a single one die. If they're supposed to be an insta kill, why not just give the player two points for that kill? That or give defending players a chance to kill the preyon even if it's very difficult.