I have stayed out of this discussion until now.
Your comment that we all agree that Chabad if not Judaism troubles me.
I for one believe Chabad followers are Jewish, but some of the group have beliefs/customs that are not the same as many other Jews.
That said, how many of us rely on Chabad for a minyan or food when we travel?
How many of us eat food processed under the supervision of OK Labs?
I come from Litvish/Yekkah forebears, but have a weekly Gemarah shiur with the local Chabad Rabbi. There may be Melech HaMoshiach posters on the rear wall of the shul, but never once in 30 years has this view been espoused to me.
When you live in small town America, Chabad is often the public face of observant Judaism.
I am not willing to agree that Chabad is not Judaism, but rather it is one variation of how Judaism is practiced.