Haven't put a foot in RvR yet but I think I understand the Vamp issue.
Correct me if I'm wrong but Vamps can have their Ult and Mist up together?
If that's the case the Vamp is able to fulfill the entire holy trinity as one single toon, breaking the basic of rock scizor pater rule.
High damage -> DPS
75% damage reduction and immune to CC -> Tank
Heal if morphed -> Healer, or Invisible what makes it 10 times worse as the Vamp becomes the ultimate AOE rogue
What needs to be done is making it impossible to have both Bat Swarm and Mist active at the same time. What also needs to be checked is corrolation with other skills to have more or less the same effect Vamp have now.
Nidwinqq Templar (healzzz) United Warhammer Vets
Nidwinqq RR100 Magus till the end, R.I.P. Badlands