Bladedancers are overpowered, mages need a buff. All the other classes are balanced.
In response to what you said about druid, we have 4 stuns. Power of water lasts only a second and uses 2 skills that can be dodged. Every melee class except bladedancer can jump/pull the druid while in punitive roots, and position bugs are so frequent in this game that it is easy to miss placement. Forest song even at level 4 can fail 5 times in a row, so stun cycling is hard nowadays since everyone has high HP and it is difficult to get consecutive successful songs. Root is the only reliable stun, but if there is a position bug, then a melee can hit from several yards away.
On top of that, druids have already been nerfed on different occasions, tornado's radius was reduced, invigorating stream had its push back effect removed, secret link can no longer crit heal. Druid is a good class, but it has its weaknesses; therefore it is balanced as most classes are.