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In my opinion, the whole point of the Barbarians isn't about having incredibly strong monsters or a lack thereof, but rather in the hero's attack. Attacking a Crag Hack at the end of the game is a great strategy.
+ two good, healthy(!) ranged units. These aren't like the archers in the Castle, who die from a gentle breeze. In general, this is probably the Castle with the most realistic ranged attack in terms of cost/effectiveness.