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It's hard to disagree with you – you've probably played a lot on XXL maps, but I don't really like them... Never mind... let's start talking in defense of the Necropolis (although personally, I would play a Sorcerer against elves, as I mentioned above).
1) We start with Orson or Kaspar as our hero (Kaspar is a more viable option here). Vlad is also possible. We focus on summoning and Darkness skills. If we choose Orson, we have strong, simple units – and while they're doing that, we cast various spells on the enemy.
P.S. I never played as Elves before today. I tried Ossir. To be honest, I didn't like it. The problem is that we suffer heavy losses at the start. I understand that the cursed enemy helps in the final stages, but it's useless when clearing out mines. I still think that if the Necropolis player has brains, they should be able to defeat the Elf – the key to victory: quickly clearing out mines, a large army + artifacts. Ideally, if you play with a hero).