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.

The maps did look nice, thank you for that link.
But the classes that exist now, need to be fixed, especially Archer and Chemist, because they get the royal hole in which to die in.