We were a little bit worried going since we had booked via Thomas Cook, who had rated it 4*, before reading any reviews. Some of the reviews (on sites like this one) were quite bad, but it was too late to do anything but go! However, the bad reviews proved unfounded.
We have been to two other club hotels in other Turkish resorts (Bodrum and Kusadasi) and this compared very favourably. There were four of us: my wife and I plus two adult children aged 19 and 22.
The isolated location was not a real drawback though Kusadasi is better, in that Ephesus is right next door, and both Bodrum and Kusadasi are more interesting as seaside resorts than Didim/Atinkum. We took the Dolmus to Atinkum once but didn’t think much of it.
I guess we can conclude that if a major tour operator rates a hotel as 4* then it probably is at least close to that.
We would go again.
(See Tripadvisor for a longer review.)