none of the above. I use it alot and like that it has pretty good critical mass so you can find entries on a lot of places. But like most travel web sites it has good information and bad. It's just one more source to consider, and you have to read between the lines like anythiing.
Occasionally there are people there shilling for places or that have some other agenda. More often I think there are people giving their genuine opinions but their perspective on things is so different then mine that it's not very meaningful, although sometimes an entertaining read. But there is tons of good information too.
I do agree it is rarely useful for getting diving specific information from. But I am still interested in hearing about service, food, rooms, facilities and other things, even if those things are lower on my priority list for a dive trip. Assuming similar diving opportunities, I'm going to be looking at that other stuff.