Of course it is, but you know, like many on here, that if I say a girl is an 8 or a 9 she is going to be hot. It is just my opinion and others might rate her differently but it at least signals something of my experience of her. I know that my mental rating scale was calibrated in the same way as several other reviewers on here and that suggests a common language.
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BTW the fact that you can refer to her as a "sub 5" and we both know what you mean kinda undermines your point. I won't bore you with a long rant on the efficacy of ratings and the debate between 5 and 7 point likert scales - just to say anything that increases the detail (and hopefully accuracy) of descriptions of physical appearance helps us all. It is generally a weak area in most reviews in my opinion.
If a punter is scoring looks then there's no experience to that, it's just geometry or lack of and how good it looks to him.
If a punter is scoring performance then that reflects how she made him feel; a combination of her looks effect on him, behaviour, chemistry and how she felt to touch, which is a very moveable feast with so many combinations getting the same score e.g. prettier to him but a bit more icy and a little tight; not as pretty, but warmer and wetter and snug; etc.
Being similar in taste to several excludes thousands of others.
I wasn't referring to this SP as a sub-5 (although photogenically to me she's 5 or 6 in face, 5 body but that's because I'm not fond of big thighs, big asses and thick bodies, see what I mean) and i have shagged less attractive girls who've been fun in the sack and overall would rate a 7/10 VFM experience, worth a repeat as a plan C. This blends looks, performance and price.
No idea why you think it undermines my point as it confirms that scores are subjective as all (London) men don't have a common uniform scale of measuring female attractiveness.
Example:
Scoring Naomi Campbell a 9/10 instead of 10 or 8 just means that a guy might like bigger tits or a flatter nose or softer curves or tighter butt or prefer another race. Me I'd give her a 10. But then I'd give Heidi Klum an 11, Kelly Brook 8, Faye Tozer on Strictly 8, Zhang Ziyi 9, etc