For me, the Blade Dancer is one of the classes that really needs a nerf. Why?
Blade Dancer is really strong in every aspect of the game, especially in PvP, where his crowd control and massive damage after selecting a specific target ends up mostly killing the enemy with no chance of a counterattack.
Another class is the Paladin and especially his 2 skills: Fetter of Justice and Sacred Shield.
Fetter of Justice with the appropriate relics is able to work almost until the skill cools down. This is sick.
Level 4 Sacred Shield provides a 100% HP shield. Are you serious?!
Why can't the Paladin use this skill on himself?
And finally, Seeker. Especially the PvE Seeker. Do you know how many movies have been made where one Seeker can complete a dungeon designed for the whole group. I wonder if group dg's are made for solo running? I do not think so.
The only character I think deserves a buff is Priest. Even in a PvP set, survival is almost a miracle. There is probably no other hopeless class for PvP. Already a Druid is more profitable due to better protection of allies or himself, and even by having area crowd control.