I've thought about this problem a lot and I'm glad to see there is a site out there trying to tackle this problem. For me, I always thought about movies in terms of investment with 4 options, "I'd buy it", "I'd rent it", "I'd watch it for free", "I'd avoid it". I think dollars speak louder then opinions. The problem is that nowadays in the world of streaming video, this scale gets completely trashed as the friction to invest in a movie is lowered considerably.

I do like the idea of production value vs replay value, I remember when I saw Passion of the Christ I told a friend it was an amazing movie i never want to see again.