I have been going to Chabad for Minyan. They have started talking about the "return of the Messiach" and how Chassidut replaces the Talmud and almost replaces the Torah. Are they all really that crazy? And if they are, why is no one in the orthodox community speaking up against them so that less informed people like me know what they are all about?

If this is the general atmosphere of the Minyan and not the sounding off of a few people on the fringes, you should daven elsewhere. There has been widespread criticism of the Messianic wing of Chabad. Most rabbis I know hope that Chabad, which has been an important positive movement in the Jewish community, will find the strength to return to itself and overcome this nuttiness.