What dishes did you try? How was the flavor? The texture? The presentation? Did it arrive hot from the kitchen? How fresh was the food? Was it too spicy, or not spicy enough? Was there something unusual or interesting on the menu that you didn't try? How big were the portions?
Was your waiter helpful? Could he answer questions about the menu? Did he make good recommendations? Were plates cleared away quickly? Was your water refilled quickly? Did you ever have trouble attracting your waiter's attention? If something went wrong with your meal, did they handle it appropriately? Did the bill arrive on time? Did you feel rushed?
Was the restaurant clean? Did it have a distinctive style or theme? If yes, what? What kind of patrons frequent the place? Was the music too loud? Was there noise from the kitchen? Were the bathrooms clean?
How does it compare to other similar restaurants? Did you feel you got a good deal for the price? Would you recommend it to a friend? Would it be good for some special occasion (kid's birthday party, romantic dinner, ...)? Is it a good place to go with a group? Are you somehow connected with the restaurant (owner, employee, relative of owner)? (If you are connected with the restaurant, you must say so in your review.) Would you recommend making reservations?