Let us have a bit of empathy for Chabad. The Rebbe was a very great man, and a true Oheiv Yisroel. He lived very simply, and was a great gaon and lamdan. His sichos fill over 100 volumes. They are filled with both lamdus and nistar. His chakiras in those sichos are no less sharp than what you would hear at any Litvishe Yeshiva. He was knowledgeable about the ways of the world, having a secular education, and many mayselach seem to indicate he was a great baal eitza, if not a baal ruach hakodesh.
He was lebedig, composing and singing niggunim, and being at one of his farbrengens, which I was zocheh to go to when I was young, was an amazing experience. No question he was raui to be moshiach, just the generation was not zocheh.
It is hard with Chabad to come to grips with the loss of their beloved leader and teacher. There probably is nobody who can fill his shoes. So yes, they are getting a bit meshugeneh, but it is out of grief and missing their Rebbe. The work they do is amazing. Shlomo Carlebach said that when Columbus discovered America, he found that Chabad was already there.
Let us remember Gavi and Rivka Holtzberg who were beautiful products of the Chabad educational system. The finest human beings ever. Any system that can produce such quality, is definitely doing something right.
What we need is achdus, not fighting and knocking other groups.