I have to agree, such a ranking system is flawed.
It's also so impersonal and cannot portray how attractive a girl is, certainly not as well as some of our good old english language.
"She was beautiful, had a sexy smile and had big firm tits and a tight round arse"
Agreed, the ranking system is flawed HB5 is funny... however, for the scientific purposes of field reports maybe:
SHB (super hot babe) - Erection on first sight... your exact 10
HB (Hot babe) - An attractive girl in your ideal range
B (Babe) - I'd do her with a nice body like that
UG (Ugly Girl) - I wouldn't do her... unless I was drunk
WP/FUG (Warpig/Fucking UG) - Not an option even after 10 pints
That takes in to account the discrepancies of the scoring system while still demonstrating the calibre of the chick in question for FR's.