Well the only issue I can see here is that the lab-grown burger had absolutely no fat in it and the tasters were not really thrilled with it. A fat-less beef patty will not taste very good because fat is what give the burger it's flavor. Kill the fat, kill the flavor. Besides the human needs some fat in it or else it suffers from what is called protein poisoning. I think this non-fat lab-grown burger was grown with no fat in order to see if they could make a fast food delectable better for obese people. But even they will know there's a difference in the taste because they are the patrons of fast food.