This seems like pure difficulty for me. When I think of thumbs up / down metrics I think in terms of "would I endorse this?"

A movie like "Suicide Squad" was (to me at least) highly enjoyable, though I thought it objectively had many problems with plot and delivery. I would probably give it 3 stars, which is relatively neutral for me (or leave it altogether unrated). If it were thumbs up/down, I would probably have to leave it unrated completely.

Maybe that's an improvement, but the more discussion I see around this, the more I realize the futility of single-axis metrics for things like this, until and unless you're asking a single question "Did you enjoy this movie" is a much different question from "is this a good movie" -- and I don't really know which one I've been answering on Netflix all these years past.