Mahesh Yogi is an enlightened soul. He has only discarded his unuseful body. He was in peace even when he was in body and he is in peace now when he has left earth. In vedantic terminology he was a JivanMukta when alive and now he has become VedhaMukta.
What he has contributed highly advanced people already know, with time ordinary will also understand his contribution.
If we sat aside our ego, we will be able to understand Mahesh yogi. Otherwise we will be only maligning him, as inspite of apparently living in luxurious world he was a simpleton, wearing simple cotton clothes, eating sparingly Ankurit Anaaj, drinking water and sleeping on simple bed.
Try to learn about his life, his teachings and you will unearth lot of jewels of life in your personal life.