For those of you that don't enjoy the Mob Arena, or haven't gotten around to playing it, there is a severe issue with most of the classes.
Class Balance
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Knight/Tank- Only viable options.
Archer- Arrows aren't restocked after running out (By wave 30)= Solution, change the bow from default to have the infinity enchant.
Chemist-Potions aren't infinite, pointless class at that point, 30 pots of harming does what? = Solution change chemist to "Paladin" make his/her items as follows: 5 stacks of Throwable Healing Pots/Gold Armour(Enchanted)/Gold Sword/Sharpness and Smite.
OddJob- Completely pointless Class, 2 TNT? and then nothing, your just screwed, basically a worse version of knight.
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Map Design
Cake is terrible, absolutely terrible. horrible flow, it looks really nice, but mobs get stuck trapped and rounds can go on for 15mins+ looking for 1 trapped dog.
"Smooth" cake out and it'd be fine.
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Scaling
Not sure if the plugin even has this feature, but the more people in the Mob Arena the harder it should get.