The wiki article for a movie can be the place for links to the internet archive etc., and also the place for people to find an agreed-on hashtag or wiki list or whatever to conglomerate reviews of the movie into one place.

Like, whoever makes the wiki article "Fight Club 1998 film" first could add a line saying "click here for a list of reviews anyone can add their review to" or "the hashtag #FightClub1998review can be used for reviews of the film" 

This existing functionality could still stand to be replaced by a dedicated platform like you're talking about 🤙