I think rewatchability is a great metric for one thing: whether or not someone is going to want to rewatch something...
Just because the data better fits your desired skews, doesn't mean it gets at what the users actually want.
I think a major issue at hand is that people often rate things as they expect a critic to rate them. If you would give Transformers 2 a 5-star rewatchability rating, you should be giving it at least 3 or 4 stars for quality, because obviously you enjoyed it very much. Instead, many people pretend to be film critics, whose jobs are very different, and assign an 'objective rating'. A film critic can not give personal opinions because he's supposed to speak for the masses--to appeal to some higher taste he aspires to have and that he hopes society would have. If you loved Transformers, rate it 5 stars--period. The rating isn't meant to be read by others, it's not meant to appeal to an idealized world, it's just how you felt about the thing. Convince your users to rate intelligently with that mindset and you'll start to see good data.
All that said, more data is better than less, and if you could convince your users to double their average rating-time investment and give you ratings for both, awesome. I'm skeptical that users would bother to rate two metrics for everything they've seen...but I think it's certainly possible they would. Be interested to see.
Just because the data better fits your desired skews, doesn't mean it gets at what the users actually want.
I think a major issue at hand is that people often rate things as they expect a critic to rate them. If you would give Transformers 2 a 5-star rewatchability rating, you should be giving it at least 3 or 4 stars for quality, because obviously you enjoyed it very much. Instead, many people pretend to be film critics, whose jobs are very different, and assign an 'objective rating'. A film critic can not give personal opinions because he's supposed to speak for the masses--to appeal to some higher taste he aspires to have and that he hopes society would have. If you loved Transformers, rate it 5 stars--period. The rating isn't meant to be read by others, it's not meant to appeal to an idealized world, it's just how you felt about the thing. Convince your users to rate intelligently with that mindset and you'll start to see good data.
All that said, more data is better than less, and if you could convince your users to double their average rating-time investment and give you ratings for both, awesome. I'm skeptical that users would bother to rate two metrics for everything they've seen...but I think it's certainly possible they would. Be interested to see.