My wife and I recently had food at Grunts. We went there based on reviews. The food was very good. My wife had red snapper and I had lightly smoked Wahoo. The restaurant has virtually no interior fashion. I gather most people elect to eat outside. We elected inside since it was raining.
Service was very good with a very personable and helpful server. Be aware that the food is cooked in an open air setting in a separate building about 20 feet away. This is ok unless it is raining and then the food is transported through the rain.
Dinner was very good and this might have been 5 star (since we really don't care about atmosphere) but the prices seemed a bit high. We had dinner as good or better elsewhere in Key West for the same or less money.