Firstly, I think, it must be stated that this is not a conventional approach on the subject. "Thus spoke Godard" -strictly. Cannot predict how an 'average, innocent viewer' (i.e. unfamiliar with Godard's films, but perhaps charmed by his name) might react to this work.
I am not a member of the Anti-Godard League, not his fondest admirer neither. Mr Godard may consider this as an insult, or why would he care about my opinion, anyway: He's an entertainer, to me. I can't take Godard very seriously as a thinker.
Raoul Coutard (cinematographer, Godard's long-time collaborator) has said: "Often, Godard's films will confuse or bore the viewer senseless, but occasionally there are flashes of inspiration and inventiveness." Exactly. Histoire(s) du Cinema makes no exception. Playful, amusing, even hilarious at times. Yes, very interesting audiovisual collage.
But then, we should complete the Coutard quote: "...there are flashes of inspiration and inventiveness that still take cinema far beyond anything done by most of his contemporaries." That remains questionable, as some of the ideas emphasized in Histoire(s) du Cinema. Well, he does not contradict himself, at least.