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You'll laugh, but among the weaknesses of the Dungeon, I can only note its high cost and the difficulty of building on maximum difficulty (eyes require 1 of all resources - this is not always possible, upgrading harpies also requires a couple of crystals and sulfur... I think so).
The heroes are good (there is resurrection), the units are strong - scorpians are not complete garbage - their construction is quite affordable, although not always easy, and in terms of strength, the units are normal - fast, they fly, they can paralyze - against a living opponent, I use them as a good blocker for archers (except for titans) -)))) - against the undead, they are weaker.
Mana vortex + portal + artifact merchant = POWER!