I was really excited when I heard that the Vampires are coming to the sims 4. I bought and loved it instantly. I found the pack really enjoying as a supernatural fan. But if you are not into the dark or supernatural things I would not recommend it to you because the pack is based on the vampires itself so maybe you would not like it.
Another lovely thing is that you can really create different vampires each one having different personalities like the gentle and the evil ones. Ranking system, powers and weaknesses are adding depth into the game.
Also the vampires are not effective for your human sims as long as don't interact with them so they don't bother you, you can also use garlic braids to defend your sim if needed.
In my opininon it worths the money you pay.