I have been to Zanzibar many times in the past couple of years. I will say they have an extraordinary martini menu which has been hand crafted by none other then Katie Cantwell. Zanzibar is a luxury restaurant great for going out with family, friends, or on dates. Zanzibars menu is a little over priced for the quality of food that is being offered. I have had some bland entrees such as the Risotto (which is no longer on the menu), the Carbonara which is severely lacking in flavor and mouth appeal, and to top it off I had the smoked duck and my sautéed cabbage was "burnt cabbage", and the duck was overcooked.
With that being said they do have some great dishes, I recommend you order from the appetizers or the bar food section. The smoked trout tacos are to die for and I enjoyed the Masala Chicken which is bursting with flavor and is very well put together.
In a nutshell Zanzibar has the potential to be great, it has the atmosphere people are looking for, the extensive drink list, and an incredible waitstaff. All it needs is to find its place with the menu and prepare the food with the rigor and savouriness I know Zanzibar can deliver.