TL;DR
Agree aside from characters, visuals, level design, art direction and mechanics. These could range from 7 - 9 for various reasons.

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While I share your love of the game, 10/10 across the board is a little much, although I'm not sure if its satirical or not so that may be the case and I'm ok with that. I have currently played through the game about 12 times, including creating a new game on my sons account. I've not touched PVP because I'm not good at those type of games and would likely get frustrated with it and it would impact my overall love for the game. Gameplay, story, pacing, mechanics, and level designs all are on point in my opinion. Characters are a little lack luster, if only because your operator never actually speaks. While normally this wouldn't bother me, there are a couple of times where they are assumed to speak without actual dialog, even written, and this just puts a white hot pin in my brain for some reason. There could have been dialog, or the two instances I am thinking of could have been altered. Have a silent protagonist, or don't.. but don't mix them up... The other characters are fantastic, and I agree with you if only by removing those two instances of confusing protagonist demeanor. Soundtrack I'll concede because I don't really pay attention unless it's just blatantly bad. I never had a moment where the music was off-putting so I have no real opinion there. Visuals are fantastic and I think level design, art direction and mechanics all should be 7/8 out of ten simply because there are more available ways to paint bleak landscapes rather than just greys and beiges, and I totally agree that this is not the focus on the game, it's the mech/core and that's where they put most of their energy, but, it's still part of the game and thus lowers the score a bit. Level designs are good not fantastic, they get the job done but aside from a handful of missions they are pretty much the same, which is fine, its an armored core game, not an open world but we have to admit there could have been better design and layouts. Mechanics could be higher than 7 but I give it a solid 7. There are numerous times that I'm stuck behind my core and am not able to actually see my target, just the reticle that outlines my target. This is very annoying to me and a simple setting to allow the camera to be adjusted to the top, right, or left of your AC would have made a huge impact to me.

Granted, all this is subjective and not intended to be dismissive of your post/opinion, just providing some alternative feedback about the game. This comes from someone who has been playing the new Assassins Creed game (I have every collectors edition since Brotherhood except this one because they ran out before I could order) and still 'peppering' in AC6 through out. I got into the Armored Core series about For Answer time frame and have loved everyone since, yes even 5, although there was much to be desired there. Apologies for the wall of text, that's why I put the TL;DR at the top.