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You're right – magic is a bit of a mixed bag. It's all useful, but some spells are just better than others.
Now, to the point. I didn't like the unchanging background of castles, regardless of the landscape. And it's also silly that any hero can appear in taverns. Personally, I don't understand why a necromancer or a demon would be in the tavern of a Knight's city. They got rid of this nonsense in the fourth game.
I also would have liked it if battles for things like crypts, vaults, and pyramids took place indoors, rather than in the open air. I was hoping that this would be done up until The Shadow of Death, but it wasn't meant to be.