My personal opinion: if you see multiple sub-par results from the same surgeon, question whether they are genuinely poor results. Is it too early to tell? is it in fact realistic in line with their circumstances ? Does it look natural or pluggy? (consider hair type, donor hair, design and angulation, number of grafts considering the area that needs coverage etc). If the answer is they are genuinely poor results, look elsewhere.
In Dr. Koray Erdogan's case, I would say there are enough posts to suggest his quality has gone downhill in the recent times (and the quality now seems to be pot-luck depending on the technician). It is not to say you won't get great results from him (as the OP seems to be enjoying), but there are simply better options out there in my opinion.