You may be right, now that I've heard more mixes, but I don't think I would want to go higher than a 5. The strange thing is, moderating it up could be - for me I guess - acknowledging a large amount of disappointment mixes I've heard, like saying they're fine enough within their field. There's at least a couple of approaches with us here with inevitable cross over, I reckon: those who like/love surround as a format in its own right, and those who like to hear music they like in surround. I fall much more into the latter category, so for example the Dutton stuff doesn't currently hold much interest to me. Brother in Arms is an album I've been familiar with (and largely liked) since the 80s although moreso in the original edited vinyl form. The surround mix just doesn't draw me to the album, there are no wow moments for me. I don't like the sound of the SACD either. I know these things can change with system upgrades, and there's probably been a few since I last gave it a go, so maybe I might enjoy it more. This is an album I'm more likely to approach in stereo, which when that is considered makes a low score make sense albeit maybe not as low as 3 in comparison to what else I've heard since.
You deserve to vote your choice, and to back it up with your reasoning is all that we can ask for. "Everybody doesn't like something...."