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As mentioned above, Necromancers are strong in certain situations, and these situations occur very frequently.
Necromancers develop very quickly and arrive at the opponent's location early in the game with a decent army.
And most importantly, Necromancers are strong because of their ability to transform creatures from other factions.
If a Necromancer only has one castle, then they are indeed an underdog. They will be defeated by almost any other faction with a high probability.
But on practically every map, there are at least four castles, and therefore, the Necromancer is always a very serious opponent.
Personally, I dislike facing Necromancers the most. They develop very quickly, eliminate their neighbors, and start accumulating a huge amount of undead. And raising corpses is a very unpleasant thing, especially considering that the Necromancer's ability provides them with an infinite mana supply.