Agree. Marshall is well spoken but he's only popular because he's an "expert" compared to 1) your typical novus ordo-ite, who FINALLY sees the corruption of new-rome and is open to quasi-traditional ideas, 2) your typical indult TLM'er, which is mainly composed of a) families, who have no time to keep up to date on catholic news, b) young catholics who prefer the TLM and who grew up in novus ordo schools, learning nothing.
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Basically, Marshall is the leader of the uneducated and busy families. It shouldn't be that way, but I can see why.