We had a similar experience - I'm sad to say - year before last. You can't deny that no Nichola and no Dogan makes a difference from the off, but it was more than that. Service was poor - waiters chatting and backs to the tables, they couldn't even see if people needed a drink etc. The new owners weren't in and maybe that showed.
When it (finally) came to ordering food, the waiter took the 3 ladies orders and went off, I called him back to ask him if he was happy with just 3 or whether he'd like to take my order too. No apology, just took the order and walked off again. It remained that way all night, desperately trying to grab someone's attention for a drink etc.
Mozaik Bahce was always one of our "must do" nights and always my first vote in the CBF Fethiye restaurant poll. Not now, we didn't even go there last year and there are plenty of new restaurants and old favourites to fill our evenings.