Need to be able to stop malicious down-rating

I’ve seen a spate recently of people giving 1 star to recipes that they clearly haven’t had chance to try, it’s almost as bad as people giving 5 stars to recipes under the same circumstances.
Couldn’t we have something that means you have to leave a comment (minimum X characters maybe) to be able to leave a rating?
That would help improve the quality of the actual ratings on recipes.


There is already a substantial thread on this subject.