A relative of mine was interested last year. There was a lengthy disussion about it on AAM. Basically, she tried to get some answers to simple questions from the promoter, in Turkey, by email but got fed up waiting and lost interest.
Some of the issues are;
Unfamiliarity with the law & language
Distance re rental/maintenenance
Likelihood of Turkey as a flight only destination(to facilitate renting out the property)
Political situation ( i.e. Muslim state - association of Western Christians with USA/UK aggression in Iraq)
Earthquake zone
On the other hand the property seems cheap . People seem very friendly when I have been there on hols but I think it is a function of the commercial aspect
Likelihood of Turkey joining EU seems stronger but wouldn't hold breath.
Slim 8)