I like the term "rewatchability" but I don't agree with your logic.
Why would you limit your pool of advice-givers to your friends?
They are good for service advice where you need someone you can trust to give you the whole and honest story.
In movies it's beyond that, it's much more important to find people with the closest match to you in movie taste as possible. The more people the closer taste match you will get (goes without saying).
I also don't see the point of giving "quality" scores. I really don't care if a stranger thinks some movie was of high or low quality. I'd much rather know if my taste-twin loved it or hated it. I for example thought Lord of the Rings was super well done and yet super boring. But this opinion of mine only matters to someone who resembles me in movie taste, who hates and loves the same quirky things as I do about movies. And of the two opinions i mentioned (well done, boring) its really only the latter that matters to my twin, he/she should pay most attention to that when deciding if to go and see the Lord, not if I thought the movie was of high or low quality.
But having said that, I like "rewatchability" as a concept to study further. I too would rip of my nails before seeing Black Swan again but I still thought it was a masterpiece. However, I have seen Requim for a Dream (Darren's Arrenovsky's previous movie) again and again although it was also very emotionally intense like the Swan. Just in a different way, less depressive, but killer strong in an exhaustive yet positive way. And then.. yet and still.. I would recommend both movies to everyone I meet. I think both are a must see even though one of them I would never want to see again.