Yes there are places far worse than Calis/Fethiye but lack of research or just the bad luck of choosing the wrong agent/builder has meant problems in our area too. The biggest problem is builders selling apartments off plan, taking the stage payments but still getting into financial trouble and getting loans secured on the properties. When they can't pay the bank, the bank takes the property and it doesn't matter what your contract says, they don't know you and don't need to.
How many people do research on the financial position of the people building their property? Probably none? How many agents do? Well some do but most sell for whoever walks through the door with a cd of pictures and floor plans. I know of at least one builder who I can only see won't be here this time next year. If I am right, it won't stop them selling over the next 12 months and it won't stop them borrowing, securing the loans on the very apartments they sell to Brits. Will the Brits ever see the property they have more or less paid for? Probably not. Along the whole coast this will happen to a number of building companies. People will agree to buy, send huge sums of money, then look for places like CBF to say "We are buying a property from XXXX Developments, are they any good?". This is because research before buying is rare, research once you get home and out of the romantic sun and the enchanting English of the builder's salesmen is over is more common. This is the "Oh God, what have we done" moment.
Now to why it is a bigger problem elsewhere, like Didim/Altinkum. It's funny how things turn full circle if you give them long enough. It wasn't long ago that we were reading that property prices in Calis & Fethiye were overinflated. "They want 50k for a two bedroom apartment in Calis and we know you can get one for 20k in Altinkum". I remember reading "If they can build them for 20k in Altinkum they can in Calis".
Villas and apartments in Turkey are mainly concrete, blocks and reinforcing steel - prices are pretty much the same across Turkey. How can they build apartments for 20k in Altinkum? They can't, it is literally impossible - and now those who bought there and thought they could are waking up to it.