DPS of Melee = Defense of Range
We already have the Ranged classes with the Same Defence as our Melee DPS - Not very good in comparison
What we need onw tho, is Melee Defence to be as good as Range DPS, meaning that we should be able to soak damage much better than other classes.
As it sits right now, Melee may have higher HP, but that does not matter end game when Mobs simple hit so much harder.
Or simpler yet, have Str. bonus to Armour = Str. * 3 = AC bonus. That would atleast give melee a higher survival chance, As with Monks, - you can already get Super high resists with 1 passive and heal yourself, your fine. IMO