warlock/cleric is in my opinion the best build on euro side, why?
you can debuff giving your party and your own skills more damage.
you can heal yourself.
you have many repot times (due to stun, slumber and more skills that stop the enemy)
you have at level 80 party reflect skill, if it reflects then nukers will die by their own damage.
you are practically a china player because of the heals, but still have more damage.
its slow to level but worth it.