I had it once, from a middle eastern restaurant in a strip mall that my ex and I were picking up to go food.
I figured that I had just got, like, the end of the pot, at the end of the day, where they had let some of the grounds seep into the coffee. Then I googled Turkish coffee and saw that it generally has debris in it.
I can't say I enjoyed it, but it gave me the caffeine boost I needed that night.
And who knows? Maybe I didn't get their best cup, being at the end of the day and whatnot. I'd like to give it its proper day in court from an esteemed Turkish coffee vendor one day.