I thought it was about time to update my review. I have been to multiple Melt locations many times and I can say the food is great. My food has always been fresh, hot, and delicious. Also, I can never eat the whole meal and the food always heats up well in the oven for a second meal. I recently tried Sunday brunch and it was very good. The food is very heavy but that is the point. If you are looking for something light Melt is not the place to go.
I have never had bad service at Melt either. The location I have received the best service and food at is the Mentor one. It is not nearly as packed as the other locations and the staff is very friendly. I make sure to go to Melt during non peak eating hours and I never have to wait.
P.S. The reason you see empty tables in a restaurant and are not seated is probably to not overload the kitchen. If not you would be waiting an insane amount of time for your food.