Things that I have seen people talk about, in no particular order:
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Pet AI. This affects several classes to the point where people go, pets suck so dont play those classes without knowing you are going to be really underpowered.
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Some classes/ranks are rarely used. Sometimes this is because the other choices at that rank are so strong or because the class/rank isnt very good. Some of the support classes are not really used since they dont provide enough of a boost to make up for not bringing in another non-support class.
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it would be neat to give monks a weapon like brass knuckles that meshes with their unarmed fighting style.



and hope to see you ingame somtime x3