Just went through the Gates of Hell and I must say I enjoyed it! We got there around 10pm and waited in line for tickets for an hour then another 2 hours to get into the haunted house. Tickets for the Gates of Hell were $15. Total time spent waiting in lines, 3 hours. I expected the long wait, considering it is a very popular attraction. My friends and I just talked and drank some beer so we didn't really care about the wait. But if you don't like waiting in line for 2 hours, then get a fast pass ($10). Although I would say you still have to wait 30 minutes to an hour. A lot of people were cold and getting tired but then again they were wearing tshirts and shorts. So some advice, wear warm clothes, bring a jacket/coat and comfortable shoes. I wore a pull over hoodie and a jacket so I was very comfortable.
Like other reviewers have said, you do have to sign a waiver which essentially says there is full contact, electricity shocking, and "psychological abuse." This is a Rated-R attraction so nobody under the age of 17 is allowed to go in without a parent/guardian. At first I was like hmmm I don't know about that psychological abuse ..then I told myself "GO BIG, OR GO HOME." So I signed! Without giving anything away, the maze was fantastic and the scene setups were gory and perfect! They really put a lot of work into production and everything was executed nicely. Not once did I feel like the actors were unprofessional or were trying to physically abuse me or my friends.
If you want to go out later, like to a bar to hang out afterwards, I would just get a fast pass so you're not spending all night there waiting in line or get there early. If you want to do all 3 haunted houses then expect to be there for a few hours even with a fast pass.