Was great up until....(Spoilers)
The scene where they find the video of themselves on the internet. Highly things happen after that like leaving the girl in the bar with creepies everywhere, they don't inform authorities, they keep going on with their "quest" etc. I thought the set up was great, though it did take a while to get it going in the right direction, but from the Giggles scene on the movie went downhill. There were so many directions the writers could have chosen to go in and they chose the most obvious and boring angle of them all. Crazy people follow them through several states and then bury them in the middle of nowhere. Dumb.
For what it's worth and if you're interested, here is what I would have done:
Drop the random doll girl and all the other clowns from following them. The crew neeeded to be LEAD in the direction of the extreme haunt.
Drop the scene with the stalker in the RV, and the video on the internet.
More exploration into crowds/forums on where to find the Blue Skeleton. IE: they travel to a few different haunts until they narrow down where the Blue Skeleton location is currently. We need to see more of their search for the fabled extreme haunt.
Add a scene where our leader/videographer both receive inside information from a haunt worker who gives them a key word and location where to meet a contact IE: the giggles scene.
Once the crew meets their contact they are abducted/drugged/wake up in various different "haunts". IE: THEY are the attraction. (this was hinted and set up when the crew is at the one haunt and there are people behind glass windows being tortured/chased, in cages, etc.)
Have the characters believing that they are being tested in an extreme haunt as part of the act, when in reality their lives are in danger.
Reveal that there is an extreme traveling haunt and a Halloween cult-like group who seeks out those who want more and more from a haunted house. This can be revealed by various members across a few states who work in backwoods haunts and look/listen for people who sort of know about the fabled extreme haunt from messages planted on haunt forums, etc. This cult-like group only limits their abductions to those who really dig deep to find what they are looking for, and their reward is being a "prop" in an extreme haunted house to give haunt goers the greatest thrill of their lives IE: real terror, real gore, real death (but the goers believe it's all part of the haunt).
End the film on the downward note with the crew members deaths, but end it with haunt goers viewing their demise in an "extreme" haunted attraction and showing the crowd report after their deaths as the crowd exclaims "it was awesome! realistic effects! definitely extreme! etc. etc.) The last interview on tape would be one of the killers in the haunt talking about a rumor of a traveling haunted house that gives the ultimate reward to only a select few who want it...
What it sees, Lo Pan Knows!