The bottom line is that ScreamFest has the stink of a junior high school dance - very loud teeny-bop music, and childish attractions aimed at getting 14-16 year olds to part with their money. The "scare" parts of ScreamFest have little sophistication, basically just people screaming at you loudly as you come around a corner.
BTW, the line-ups for the attractions are HORRENDOUSLY long. Prepare to be very bored.
If your 30+, there's nothing for you at ScreamFest. Nothing. You'd be much better off finding a pub/sportsbar with a Halloween theme night, you'd have a lot more fun.