Two things: -
(1) Do a Google search "burgess site:thepropertypin.com" and have a read of some of the many posts attacking Brendan Burgess. I may not agree with everything Brendan says but I have huge respect for the fact that he set up Askaboutmoney using his own time and money for no personal gain and it has genuinely helped thousands of people with their financial education over the years. He does not deserve the (sometimes highly personal) attacks on his good name and any site that permits such attacks is worthy of nothing but contempt.
(2) I fundamentally disagree with speculation being touted as fact, just because people can make impressive-sounding arguments to back up their predictions.
I accept that Property Pin may have some useful posts and posters. I haven't seen any but if darag says they are there, I respect darag's opinion from previous experience. But the above two points utterly devalue them.
I accept that these attacks are unacceptable to anyone and I also disagree with speculation being touted as fact, but if facts are what you want regarding exactly where the property market is at (% price drops in certain areas, history of drops on houses), you won't find it anywhere but on that site. And for that reason, it has its merits. Any of my friends that have purchased in the last 18 months that I've spoken to have used it and its an invaluable tool.
A bit like if you are looking for the best savings rate, you got AAM......if you are looking for a recent history of price drops you go to propertypin.