Builds hard countered by kits (PVP)
Eh…it’s not really that simple, even if thieves do tend to get melted by bomb kit.
However, I think you could say that heavy conditions applied by kits like bomb, grenade, and elixir gun are easily countered by necros. Also, the multi-hit aspect of grenades and the frequent damage tick of the flamethrower auto do make those kits susceptible to taking a lot of damage from retaliation.