Kusadasi is not one of the top food destinations in Turkey. I can recommend you few places per my experiences. If you like seafood, "Kazim Usta" or "Sea Garden" are good. I don't know where you are from but if from N. America, try something which you can't find in US. I suggest fried fresh sardines or anchovies, red mullet, grilled octopus, domestic blufish or John Dory. For more trditional meat/kabob options, I suggest "Degirmen". Everybody knows these places in Kusadasi and I am pretty sure the concierge at your hotel can arrange the reservations. Good luck.