GENERAL

ENERGY
An economy based entirely off of micro-transactions, yeah, can't tell why that isn't working.

LOCKDOWN
PROBLEM: There is virtually no balancing whatsoever, only a few weapons can even be used if one has ANY hope of beating the opposing team. As it stands, the game might as well automatically provide them with a Divine Avenger, Gran Faust, Final Flourish along with full Skolver, Vog Cub, Snarbolax. Because if you want to have any hope of winning, that's what you NEED to use.
SOLUTION: I really would like to see the player be able to choose their equipment, but unless some weapons are temporarily nerfed for the duration of a Lockdown match, that is simply not possible.

LOCKDOWN CLASSES
PROBLEM: Striker completely outclasses both Guardian and Recon. Strikers are able to practically 1-hit any other class, and pursue someone from across the map without breaking their shield. Guardians shields are as thick as paper, and the healing ability is negligible at best. Recons invisibility is given away by the constant pulsing of the cloak, and the death mark is practically unnoticeable.
SOLUTION: Lower the damage bonus and speed increase to low on Strikers. On Guardians, Make their shields actually worthy of being called shields, and speed up the healing effect. On Recons, add the ability to turn off the pulses, and have the death mark truly act as though it is the mark of death.

MISSIONS
PROBLEM: These have completely rendered the Arcade obsolete, and give players no reason to do random elevators in the arcade.
SOLUTION: Perhaps the Arcade and Missions could be combined. Say, if one were to have a mission where they needed to do a particular floor (let us use candlestick keep as an example) then one will have all the candlestick keeps in a particular stratum glow (or something) on the gate map, telling that person that they would need to get to that floor and complete it.

HALL OF HEROES
PROBLEM: The recipe economy has been driven into the ground.
SOLUTION: Unfortunately, the damage has already been done. The only way I see of reversing this, is to delete everyone's learned recipes, and getting rid of the Hall of Heroes altogether. Maybe change it to a “weapon/armor-demonstrations” area instead of an “economic calamity.”

TREASURE VAULTS / GRAVEYARDS
Problem: Treasure Vaults really don't give very much, whereas Graveyards give significantly more.
Solution: Make people WANT to get a Treasure Vault, and make them FEAR Graveyards. Try using the danger room reward rooms as a basis for Treasure Vaults, and have Graveyards' difficulty buffed, while also reducing the crown and heat output.

WEAPONS

STATUS EFFECTS
PROBLEM: For the most part, only elemental weapons cause status effects.
SOLUTION: Make more shadow weapons inflict curse, and maybe poison. Then give piercing weapons something.

SWORDS

SPUR SERIES
PROBLEM: The weapon is virtually useless.
SOLUTION: Maybe have each regular swing send out a flurry of disks, then just buff the charge to a reasonable point.
NOTE: This could also use a 5*.

TROIKA SERIES
PROBLEM: There is not much incentive to use the regular combo, and the charge leaves the player incredibly vulnerable, still without much incentive.
SOLUTION: Have all attacks do MUCH more damage, and maybe give the charge attack a 100% chance of causing its respective status effect.
NOTE: The other variants could do different forms of damage.

FAUST SERIES
PROBLEM: Charge attack can self-inflict Curse
SOLUTION: Get rid of that. Having the charge attack self-inflict anything doesn't nerf the weapon, it just makes the charge attack worthless. Maybe just lower the frequency of cursing enemies if you want to nerf it THAT badly.

FLAME OF VOG – See, faust and replace “curse” with “fire.”

HANDGUNS

BLACKHAWN SERIES
PROBLEM: The damage bonus seems a little misplaced, as guns are almost completely useless versus any type of gremlin.
SOLUTION: Change it to jellies instead.

MAGNUS SERIES
PROBLEM: The combination of; recoil, not being able to move, and a 2-shot clip make this a very bad gun type.
SOLUTION: Get rid of the “not able to move,” and make it say, a 3-shot clip with a slow rate of fire.

BOMBS

CRYSTAL BOMB SERIES
Pretty solid work OOO, I didn't really have a solution to the old crystal bombs, but they definitely did have a problem. As it stands, the update was incredibly good for the status of these bombs.

GRAVITON / ELECTRON SERIES
PROBLEM: When charging up the bomb, it slows the player down to a snails-pace.
SOLUTION: There really is no reason to have that, so get rid of it. If you really want to slow something down, maybe just increase the fuse time or something.

ARMOR

WOLVER SERIES
PROBLEM: The incredible defensive capabilities and offensive bonuses completely out-class any other types of armor.
SOLUTION: Toning down the offensive bonuses is a must. Along with that, the defensive capabilities must also be toned down. If someone wants to have a sword damage bonus, they better be prepared to risk a lot of health.

DRAKE SCALE / CHROMA / VALKYRIE SERIES
PROBLEM: These armor sets' bonuses are completely eclipsed by the wolver sets.
SOLUTION: Make the set bonuses for the 5* sets a damage bonus maximum.

CIRCUIT BREAKER / EMBERBREAK / FROSTBREAKER SERIES
These armor sets definitely need 4* and 5* sets

QUICKSILVER SERIES – ***BIAS ALERT***
I believe this should have an attack speed increase added, and for the movement speed increase set bonus for mercurial armor raised to maximum (medium only adds 8%, which might sound nice, but it is almost unnoticeable).

SHIELDS

BRISTLING SERIES
PROBLEM: The shields have pretty good defenses and health for their * level, but IMMENSE attack bonuses.
SOLUTION: Either tone down the attack bonuses, or drastically reduce the defensive capabilities. Actually no, do both.
NOTE: Just look at the swiftstrike, try and make it like that.

SWIFTSTRIKE – ***BIAS ALERT***
I believe this could do with a 4* and 5* upgrade

tl;dr Well, that's you're problem.