I didn't mind Vamp 85 because that's actually my graduation year.. that's MY era. Was it the greatest scarezone ever? Not by a long shot.. but I'd sit there all day and night before ever walking thru Chucky. My two fave scarezones were KK and Twisted Traditions (because pumpkins in trees make my heart sing - don't even care what actors are in there).
As for the "adult themed" event vs "under 18" event.. I don't understand why this is a discussion. I've been going since 2005, and I don't see intensity changes in the overall event. For me, there are always a couple of houses that will be "scarier" than the rest which plays to those of us who ALWAYS want it to be scarier. I'm good with that because I also know "scary" is a very subjective thing. I think HHN does a great job of having a wide range of themes for the houses, so they will scare as many people as possible.
Generally speaking though, I've always thought this was a PG-13 event. Do I want to see a bunch of middle school kids taking the place over? Hell no.. that's what Disney is for. Realistically, I don't ever see that happening. Let's use common sense.. Adults have JOBS and they can DRINK.. which means they have money.. oh, and they can DRINK. Uni would be laughed out of the biz not to continue to court a very profitable segment of the population the way they do now.. that is: Adult horror fans willing to drop hundreds on tix and merch - most often multiple times over during the length of the event.
I'm ok with some IP houses - even though the originals are always my favorites every year. However, 28 rocked Poltergeist to such a degree that it damn near brought me to tears the first time I went through. It was an outstanding tribute to a classic horror movie which also brought back my childhood. You could feel A&D's passion oozing out of every nail, every crevice, every coffin in that house. That being said, Scary Tales was my favorite house overall.. and I loved Seeds as well which I didn't expect to. I thought the scariest house was Dead Exposure though - mainly because of the strobe/dark combo really, really affects me. Again, to my point - lots of variety, and I love that. This is what I want to see year after year. That way, when there is a turd in the punch bowl (looking at you Blumhouse), I'm ok with it because there is so much other stuff to spend time on.