I think there is too much emphasis on scores in the polls. (And it uses up a lot of mods' time.) I think words are much more important. But I decided to make an effort to vote more - there are quite a few polls I've commented on but not voted. I do also think people vote too highly, which means it's difficult to differentiate the entries.
I understand the concern about voting if you don't love the music, but I think I'm able to separate the two (mix vs music). I sometimes worry that the opposite effect is in play - I suspect there are a lot of votes where people clearly love the music but are then over-impressed by the mix. So forcing yourself to separate out the elements - music, mix and sound - helps to clarify what you really think. I think that voting on a release, even if I hated the music (which I don't in this case), is valid. Quite possibly more useful. If I read, "I love this band!! 10/10" I would not take too much notice. But if I read, "I really cannot enjoy the music, but the mix and sound quality are undeniably great, 7/10" it would mean more to me when making a decision on whether to buy.
For me personally, the Clapton disc would be a 6 or maybe a 7. It's well recorded and the mix is a little conservative but I still thought the mix was good. I would never listen to this in stereo. So in music terms it's a 5/10 but the mix and sound make it a bit better for me, so I'd give it a 6 or 7. In an attempt to make my vote more useful, I weighted it - tripled the mix, doubled the sound. This gives a total out of 30, which I divide by 3. Which gave an 8. This felt right as it is higher than my personal rating but the mix and sound imply it should be. Like I everybody else, I reserve the right to change my mind and also to 'massage' the score if it feels right (i.e. push it up or down a point.) I think we all do that, but at least this way it forces you to notice that you are doing it.
I did wonder whether to include the 'music' vote at all, but I think that is valid, just not as important, hence the weighting for the other elements. E.g. I love The Beatles, I like all their albums. But I will still rate White Album higher than For Sale. So if they had the same sound and mix quality, it makes sense to differentiate them slightly based on music.