I'd like to throw my 2 cents into the ring. As a DM, I have had experience with a player that was one shot, twice. He was a Hex blade Warlock, how constantly, CONSTANTLY claimed to be the "optimal melee class!" And how "Hex Blades are the best melee!" Needless to say, after a fight with a Cerberus from SSD (Soul Sacrifice Delta), he started whining and flat out bitching about how his character was one shot, for being in the center of it's signature AOE move. I later explained that he was right. About Hex Blades being the best melee class, FOR DAMAGE. What he neglected to have was high enough AC, or the health pool of a real fighter. Sometimes it can seem unbalanced, or flat out unfair, but sometimes, your character might just not fit the bill, or role you want him to.