I have been camping for almost 20 years.  I have purchased  three 2 in 1 grill/stoves.  One for my travel trailer, one for the Deck and one for my Grandson.  Never had a problem with the grills melting.  Looks to me, it's an operator mistake, you light the stove and keep the flame low, otherwise you burn your food.  I guess if you turn the stove up "Balls to the Wall" you could milt the cooking services.  Low heat and the food is great and the stove will last years.