I have only ordered delivery and never eaten in the dining room, so my review is based on their take out menu.
I have tried several Greek restaurants and always find myself coming back to Mykonos! Their portions (with the exception of the chicken in their Souflaki dinners) are quite generous and the quality of the food is very good. I am especially fond of their Greek fries and tsatziki.
Not the cheapest but overall very good. The delivery man and restaurant staff on the phone are all very friendly. Delivery is almost always on time or faster than expected.