This module is a good example of what a GM can or cannot do when handed a piece of s**t. If you're GM made this a fun adventure, you need to give them a big hug, and tell him/her that they are the greatest GM ever!
There are numerous reviews covering the individual pain points, so I'll cut off my own rant about them.
To any GM who gave this a 5-star review, you are either deliberately posting a false review, or are reviewing the wrong product. There are real issues with this module that cannot be overcome without serious alteration. To me, you are doing a real disservice to others who could be spending their time with better products.
I've spent a lot of money on Paizo products. I could easily see myself playing Pathfinder for another 10+ years. I know companies don't like to write apologies, but this product really is a "turn off" to me in a big way.
Paizo, you will start losing my money if this product represents your acceptable quality of adventure writing.