I would say this SERVER is pretty unbalanced due to severe mods and donations for MVP cards.
Example: Biochemists have it waaaay too easy with an NPC that sells them their supplies for killing while on some other servers they have to farm stuff.
The way that this server modifies things from the original (cards/weapons properties/monster properties and drops) is the sole reason why many people complain about it in my opinion.
It's not so much the classes in my opinion that make this game unbalanced. I also see many people complaining that adding something new make everything broken when things were more or less broken already from the previous modifications. It also feels as though many of those players (Yes, that includes many of the veteran players, too) of this server have never stepped foot onto other servers with the later episode updates from hearing all the complaints. I actually welcome the stuff.