Pull them one at a time with silenced weapons. Use knockdown(slam, paalm, or the special move knockdowns) abilities to keep them from [censored] your face off. Maybe get palm at level 14 and come back.
You are better off using Unarmed than Melee.
Paralyzing Palm is absolute win against 1 Death Claw. If you get surrounded ... well then you are a gonner.
This is on Very Hard, might be different in lower difficulty. On VH you simply cannot kill them fast enough with melee weapon before they eat you alive. The knock down perk help a lot though. I managed to take a few out with knock knock (1 at a time however).