I actually did the Goretorium. It was fine. A good maze, but nothing super memorable either. I think it may have had a very small bar and gift shop, but not much else. So I think a key difference for Unleashed will be the scope, and being a more complete experience.
As far as scareactors, I mentioned this once much, much earlier in the thread, but I did Ghostly Manor in Sandusky, a year round haunt near Cedar Point. And they only had two scareactors in the whole place, but they were able to move around and get you at multiple points, so it felt like a lot more. It was surprisingly effective.
But animatronic scares would have to be a given. Fright Walk at Santa Cruz Beach Boardwalk and Frankenstein's Castle at Indiana Beach basically have no live scareactors at all... but since you're basically in there alone, they can still be pretty effective.