I have guns and melee char, and melee owns so hard. With a super sledge and remnants power armor, deathclaws die in 3 normal strikes.
Excellent point, to do melee effectively, you really need serious high-DT armor because you can't take things out at range before they get hits on you and you have to brave the barrage and the bedlam to get up in the face of enemies with shotguns and assault rifles.
Powered armor is critical to a high-level build, the damage you get from the ST bonus and the high DT will make you a god. Combat Armor Mk 2 is alright too if you don't find a way to get trained in powered armor.