There are good Turkish wines but not much of it ends up in Migros or your local bakkal. The decent stuff is pricey and only produced in relatively small quantities with the bulk of it going for export.
Been lucky enough to try a few of the good ones (on other people's expense accounts!) and was pleasantly surprised. Can't remember exactly what they were now, but do remember looking out for them in larger supermarkets without any joy.
JF