Wlk777
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This is definitely the strongest Castle, but not invincible, in my opinion.
If you ban Tarsformer (which is done in serious games), Necropolis is still above average. Arguments:
Anti-morale for the opponent (almost always decisive)
Vampires. If you protect them, they become decisive in the end.
Liches.
Ragmen-mana in Town 3 is always decisive.
Cavalry-double and curse (all units that cast in Town 3 are extremely valuable)
Curse and blindness don't work on undead
Berserk only works with the Orb
Weaknesses:
Sludge Dragons (but if you're lucky with aging, they can be decisive)
Today's games have convinced me of only one thing: you can't give Necromancers Castles with cavalry, but with the support of strong units (like Archons and Crusaders) from another Castle, you can create a powerful combination. The rest of what is written is quite debatable and often depends on luck.
Added 1 minute ago
If 0-3 doesn't change your beliefs, then what does?