Moore has signaled that he's taking the general election seriously and will actively campaign throughout the state, not just in the Baltimore and DC metros.
Moore embodies a lot that I can't stand about liquid modernity, Maryland politics, and the way that broader society engages with deprived communities, but he was ultimately the lesser evil against the entrenched corrupt conservadem and the Beltway-brained union-buster. I'll most likely vote third-party in the general (Green or Working Class) since he clearly won't have any trouble dispatching the face of the MDGOP's rejection of Maoist Fat Larry (bulldozing the City of Baltimore is the floor, building a Naypyidaw-tier highway in Garrett County is the compromise, just cancelling the Red Line is a humiliation).
You may be right, but I wouldn't dismiss him immediately. I think he won because voters were looking for someone new. I've met him a few times and he didn't have the same aura that other politicians tend to have. He seemed to have an authenticity that the others lacked, and stuck to positive themes in the primary.