I had a good meal down and back to Istanbul last week when I took some contracting work on for my old company which resulted in a day trip to Istanbul. It was my 8th flight with Turkish and I have not had a bad meal on any of them. I would say tyring to do it in the day was a challenge, as it was 23.30 from Man and a 22.25 return, and I am getting a bit old for that sort of day.
Cheers
Mr Mac