Hands down the worst airline I have ever dealt with. We couldn't check in online on the way there and when we phoned the staff were rude and hung up on us.
Thankfully it was sorted out at Edinburgh Airport by the staff there. On the way back same thing happened but at Istanbul Airport they put us on standby. They promised we would get seats at the gate. We did not.
We then got shouted at when we were trying to find out what was happening and it took hours to find a staff member who could help us. We were then given a slice of pizza for lunch and got shouted at by another staff member when we asked for our bags back (apparently it is a lot of work for them).
After hours we got taken to a dive of a hotel. We were given inedible food in a very unclean hotel. The next day we got on a new flight and were told we would get 400 euros at Edinburgh Airport.
When we arrived at Edinburgh there were no Turkish Airline staff or a desk so no money for us. Guess we need to phone back up to get shouted at some more.
Honestly horrendous experience. Made me cry multiple times. Wouldn't wish it on my worst enemy!