It’s a good site, I think it has potential to be VERY useful.
One thing that bugs me is that there are several instances of the same dive site in "Dive Sites" section. For instance, I did a search for all sites in USA, state of TN. In the results, Loch Low Minn showed up 3 times (with different site IDs), Martha’s quarry 2 times and another site 3 times also.
I understand that this is probably caused by members adding a dive site without checking if it already exists or problems with alternate spelling, but it’s a major inconvenience. It means that if I want to see what experience someone had with a particular site, I might have to look in 3 different places (same for photos, etc).
I’m also more reluctant to waste time putting in my dive information and reviews for the dive site when I have to go do it in several places (or put it in one and risk it never being seen or of use to anyone).
I think some process for disallowing duplicates (perhaps some vetting process), or a process for removing or merging existing duplicates (by administrator or by community) would make the site better.