Warden tanks are overpowered i think. I can give AOE minor + major breach, minor + major resolve, minor vulnerability, heal myself and others. I like being overpowered though, so i would not nerf anything. Maybe a revival skill like necros have?
Introduce a Magicka Based Tanking Skill line, to include an a Magicka based Pull and an AoE Immobilization tool for classes that don't have either.