Whether or not they are aesthetically pleasing is not in question, their existence and their influence is. You can discredit serialism as much as you want, the voices of people influenced by it greatly outmatches you. It is ridiculous to declare a technique dead because you personally don't enjoy the results. And if you declare it dead because you think nobody uses it you are ignorant and wrong. The development of serialism was a profound development in modern music, one whose effects are still just beginning to blossom. It is pumpous arrogance that ignores this on the basis of personal taste.