MagWarden is super duper strong in group. I've just been testing in nonvet because I'm not all about grinding to 50 and then PvPing, but I've had no survivability problems running 7L between dampen magicka and healing ward. Still unsure of whether or not soothing spores feels worth it - I might test the heal on light and heavy attacks. This is just in pretty suboptimal gear with 5x necro, 4x seducer, 2x Magnus in purple with the mage mundus (because I'm too lazy to switch). Hits 46k max magicka, nearly 3k spell damage buffed, and 2.2k recovery. I tend to play mine more like a dot build where I mix in shalk every few attacks to add a burst that people seem to account for very poorly.

Much more excited for stamina warden in solo play. The burst already on MagWarden is unreal.