In their defence, have you ever seen a SAW film? Now, they're alright films. ...
Yes, I watched the first Saw film thinking it would be clever like Seven, I was disappointed. I've also watched one of the later Saw films - Saw V, I think. Whilst I don't doubt there is an underlying story that is quite clever, I'd also be extremely surprised if the majority of viewers are watching for any reason other than the clever and graphic ways people end up dead. I did try to watch The Hostel, but that was one I just had to turn over.
Anyway, I don't want to drift the thread off-topic with a critique of the films.
Even a Saw film fan wouldn't claim that the films are suitable for a 12 year-old audience would they? So an attraction that is based on the extreme horror of the franchise that is suitable for 12 year-olds is either going to disappoint the fans, or be unsuitable for the younger teens.
But then how many 12 year-olds will have seen all the Saw films already... when I were a lad... it was Nightmare on Elm Street that you tried to watch on video in your mid-teens. I guess Saw is the current generation's Elm Street.
I'll reserve judement until after I've read more than just the press previews.