I agree with that gkbiii, plus IST is a fantastic airport for connections IMO and TK's route network is superb (one reason I swapped from UA MP to TK M&S as my primary FF program). TK fly to places I need to go regularly where no other Star Alliance airline fly (eg BUS) , and I find TK onboard service and biz food/drinks really good and pretty consistent (at least so far).

I'd also add that with TK you get access to the Primeclass Lounges (run by the Turkish TAV company) which is a good option. For example, as I wrote, last week flying out of LEJ, the LH lounge was really disappointing, so after a coffee there, I went to the Primeclass lounge next door which had a good selection of food including freshly made salads and fruit which was great for breakfast. If you were *G or in C/J flying LH, OS or LX out of LEJ you wouldn't get access to the Primeclass Lounge and could only go for the LH lounge.

Only reason I did not include TK in my review is that OP said "Turkish is no good for my itineraries." But I'm pretty happy with all of my TK flights thus far and would put them in the category 1- "best" along with OS and LX.