It all depends. Adorno did his greatest and most socially committed work at a considerable distance from practical electoral politics. Academia didn't stop Bourdieu and Jameson from doing great things. Sure, Moore's film may be better than a hundred other documentary films, but one text by a cultural critic may outshine a hundred other texts.
Theorizing is ferociously hard work. One has to struggle with oneself, as much as with the concepts and texts, as well as the historical constellations lurking behind the texts.
-- DRR