Nature Structures

No, Drakkosha understood me correctly. I didn't mean the spell, but the skill. Sometimes it's very useful. The main thing is to summon the right creatures. To do this, you need to upgrade it to the third level. Then neutral creatures will start appearing. And the Druid chain and the Ring of the Elements will enhance it. This is powerful, especially in online games.

This summon isn't always good; sometimes it just takes up space. It takes a lot of time for a hero to summon a sufficient number of creatures, and to get the ones you need, you have to fill the slots. Otherwise, "extra" creatures of the same level won't be summoned. In general, IMHO, I really don't like this skill; I think it's useless or not very useful compared to other "special skills." The Barbarians are always left out, and even the Elementals at level 5 are sometimes just unnecessary. Either there are two heroes in the army, or Mantises or the Hive are taken from the portal, which, in my opinion, is more effective than even a Water or Earth Elemental.
P.S. In general, it's a matter of taste and skill, but that's how I see it.

Added 8 minutes later

Yes, I agree that special cases like offline or online Tournaments need to be specified. But I do this constantly. Therefore, I repeat that in a simple offline game, against the AI (not for speed), the creatures will be no worse than vampires. Here, it's simply a matter of changing the usual tactics and partially abandoning the Necromancy upgrade. For example, upgrade only two levels, and then switch to upgrading other skills. Or switch immediately to, say, Martial Arts or Tactics, or another magic (for example, Nature). Agree, this is not uninteresting and not cliché. And therefore, it offers at least some variety, which I always welcome in strategy and tactics.

But the AI doesn't welcome or understand this. In general, you can't really experiment with this in tactics; it still turns out to be quite monotonous, especially in the siege of the AI's castle. Why can't anyone explain to it that if it has an army many times larger in battles against Nature and Order, it should immediately go forward, instead of sitting and waiting for me to summon hordes or create illusions....