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Lesha-punk, I don't want to upset you, but in Heroes of Might and Magic III, both Goblins and Spearmen were effective because of their high numbers and good stats. Not to mention that Spearmen are arguably the best unit at their level. Castle often didn't buy Swordsmen because they are essentially a slightly more advanced version of Spearmen.
The lack of tanks in the Necropolis faction is noticeable because if you teleport a Hydra or Golem into the neat rows of your army, you can't ignore them. You'll be forced to fight them, and there's no one in the Necropolis to send forward to attack the enemy's mages or archers; sending only Vampires forward means they'll be lost, and Spirits probably won't help either.
The lack of tanks in the Necropolis faction is noticeable because if you teleport a Hydra or Golem into the neat rows of your army, you can't ignore them. You'll be forced to fight them, and there's no one in the Necropolis to send forward to attack the enemy's mages or archers; sending only Vampires forward means they'll be lost, and Spirits probably won't help either.