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The swamp appeals with its unusual nature.
I have the impression that the main disadvantage of the swamp is the great difficulty in clearing out neutral creatures BEFORE serious battles, when it is important not to win the battle, but not to lose your units. Almost all castles (except perhaps Inferno) have a good chance, with a certain tactic, to defeat medium-strength neutral creatures (up to level 4) without any losses - for the Swamp, this is problematic - the only ranged unit does not provide the necessary firepower, and dragonflies and basilisks, although not weak units, can suffer losses in melee combat even in a fight with not the strongest opponent. Plus, the limitation in magic, of course...