Kyle Scharf’s review published on Letterboxd:
Welp, after the much more fun and lively Part 5, Part 666 (see what they did there?!?) goes right back into the garbage bin. Just awful, even with the return of John Franklin's Isaac, who looks tired and like he has no interest in being there. As a creepy child cult leader? Pretty good. As an old man who is height impaired? Not so much.