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It's a really cool scenario, and the main thing is that it's dynamic and won't let you get bored. Of course, there are some balance issues; the initial encounters are good, but after a certain point, not too far from the start, you can clear out the neutral creatures on auto-battle without any losses. The battles with Glen were ridiculously easy; I cleared them with a single stack of vampires in just a few turns. Duncan also wasn't a problem; when he took everything from the human castle and attacked the main character, the vampires just wiped him out.
I haven't finished Randall's final battle yet because I was playing the end a bit too carelessly. The fort at the bottom can be cleared on auto-battle without any vampire losses, and Jezbeth is also cleared on auto-battle. The final Glen was also cleared manually with just vampires and no losses. The final demon isn't too difficult either (6666 imps do drain a lot of mana, but you need to cast Vampirism on the vampires in time, and you should also get the artifacts Darkness Seal and Weakness to Darkness, otherwise he'll cast Mind Control on your vampires). Randall turned out to be a tough nut to crack, but after the auto-battles, all that's left of my troops are vampires, and the castle's weekly growth rate is also good. I'll think about what to do with him.
But overall, the scenario is excellent