Having seen Bianca myself several years ago I don't have any problem with the content of the review, limited as it is. It squares more or less with my experience of her. I wouldn't rate her as the best in Soho but she was definitely one of the better options then (and possibly now) and would add that she is possibly one of the most underrated girls in WC2.* The mistake the reviewer made, I guess, is not giving us a fuller review if he is going to post in the reviews section. Fly-by reviews (described as such above) are welcomed in the Soho walkup thread (always on page one of the London RFI sub-board) and up until a year or so ago was the only place where walkup encounters were reviewed in general, perhaps a legacy of the walkups' marginalisation on another site that declined and has since changed ownership. Soho FRs were discouraged on that site and there was only a single walkup thread that perhaps was the template for the one on this site.
In summary shorter mini-reviews of walkup girls are welcome but are best placed in the walkup thread (read more by Soho specialists), as is the case with massage shop encounters which also have a thread for mini-reviews and discussion. If you're going to review them here (and that's fine if you do), be sure to give us much more detail.
I should add that I didn't see Bianca for an hour (just the conventional Soho quickie) and if you did see her for a full hour, then you could make a case for saying that a review here is really called for (rather than just a mini-review on the Soho thread), but as noted above, this should have much detail if you're going to do that.
* Footnote - Possibly her reputation unfairly got a dent because around two years ago there was another Bianca (at Lisle Street) as I recall who was supposedly pretty awful. Soho punters may have read her mini-reviews and have mixed the two Biancas up.