[stuartjmoore]

In this context, it looks like the user has incentive to rate (to get better suggestions), but on rating in general:

Why even ask people how they feel?

Depending on the content, you can analysis how they use it to get a much more accurate rating. For video: Did they watch the entire thing? Did they leave after a few seconds? Did they share it somehow?

That (slightly off-topic) being said, this looks great.