I've been to many, many Greek restaurants in my life and I have found that there are two categories of Greek restaurants: wannabe's and the real deal. Zorba's is definitely the real deal.
The Service: prompt, helpful, and very friendly. My glass was never empty (quite a challenge for me as a customer) and my waiter kept my table clean at each course of the meal.
The food: Though technically not a greek food, Zorba's hummus is simply excellent. I also really liked their Greek salad and Avgolemono (chicken) soup. While I was there, a lady actually came in from UNC Hospitals with a ""prescription"" for Louie's famous Avgolemono soup. As far as entrees, I tried the local favorite, the Yeeros Platter and loved the potato and actually discovered that I like green beans if they're cooked here.
Top off the meal with baklava or italian icecream cake. Come hungry.
Pros: Friendly, Clean, Authentic