Unarmed is when your weapons break - beside that it's not useful.
Stealth is amazing for sneak attacks that can one-shot a troll in black forrest phase.
Archery seems overpowered until you meet monsters resistant to physical and piercing, Meanwhile shields are useful for reducing damage taken / block completly with heavy shields. Esspecially vs guys like Bonemass or Abomination.

For me the least useful are swords, and except iron mace for bonemass maces (Especially Club after H&H update).
Same for spears and heavy weapons, most of the time.

Most useful are knives, and bow followed by axes.