I know many other people also liked Cavern of Darkness, however I didn't really understand that one. I think most people just liked the novelty back then of using a space that had been unused for HOS since 1999.
The space only worked well because they hardly changed anything. All of the rooms were still easily recognizable. Fast forward to Scarlett's Revenge, they finally made an attempt to fully disguise the queue line. Also, I agree that it's still a horrible, limiting venue.
I believe that Scarlett failed across all of the parks when bringing it from concept to reality. They had the film director Robin Cowie to help with the story, but they needed someone with maze experience also. The Unearthed theme was mainly created in Tampa, in collaboration with BGW and SWSA. Mind you, Tampa recently lost one of their creative people who has been working on HOS from the start, Scott Swenson. I have yet to see anyone pick up the pieces.
In my opinion, although all parks used a new strategy, it ultimately failed after marketing. I am really saddened by that, because I really liked Scarlett and would love for her maze to work. We will most likely get to see if it will turn out better this year.