The New Yorker concludes with this:
“Ganja & Hess,” like the movies of Gunn’s great independent-outsider contemporaries, suggests what has been missing from modern studio filmmaking—and what’s missing from Hollywood to this day.Slant Magazine says,
Ganja & Hess, which has been retroactively, circumstantially cast as a berserk dash toward career suicide on Gunn’s part, is so singular, so opaque, that it doesn’t even have the draw of commerce-friendly exoticism. If Shaft is Barry White and Sweet Sweetback’s Baadasssss Song is the Sex Pistols, then Ganja & Hess is John Cage.DVD Talk opens a positive review with this:
Not just an important horror film but one of the true "lost films" of the 1970s and a significant piece in African-American cinema, Ganja & Hess (1973) so transcended genre and overall aesthetic expectations that it all but doomed itself to a fate of almost total obscurity for several decades.Rotten Tomatoes has a critics score of 83%.