To be honest, it didn't seem like a cheating unit to me. It's certainly hard to get a correct impression of balance from duels, but playing as Dungeon against Inferno, I always won with a loss of about 10% of my army. Maybe the presets are poorly designed for Inferno, but not to that extent. The faction probably turned out a bit weak too. Gating only works well against AI; a human quickly figures out in what order to pick off Inferno units.
To be honest, it didn't seem like a cheating unit to me. It's certainly hard to get a correct impression of balance from duels, but playing as Dungeon against Inferno, I always won with a loss of about 10% of my army. Maybe the presets are poorly designed for Inferno, but not to that extent. The faction probably turned out a bit weak too. Gating only works well against AI; a human quickly figures out in what order to pick off Inferno units.