Comment: Not easy but

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In reply to comment: I'm interested in this (see in situ)

Not easy but

how about a slider +/-10 / strongly agree /strongly disagree ?
I have down voted some posts because most of what they said I disagreed with, even though some I did agree with. Likewise I have upvoted posts because I agreed with most of it. I usually try to make a short post pointing out what I did not agree with, or what I agreed with. But a slider would allow me to select an +7 or -7 depending on how much I agreed with the post.
Altho, that may make it harder to build up any statistics!

Of course there are many posts that I have no opinion on and don't up or down check them. Then I could just leave the slider at zero.