even if you look at the original superteams most of them were darker and greyer prime example being avengers which consisted of the hulk a misunderstood tragic berserker monster, a billionaire playboy who was constantly under the threat of dying due to his injuries, a soldier out of time who was thirsting for vengeance for the loss of his comrade, a dilettante whose father was murdered tragically and who tried to hide her pain under a cheery facade not to mention a scientist who had more issues than you can count and finally a god who was banished to live among mortals. not exactly a stable happy professional team.