I would assume by building a reputation for fair and accurate reporting. Again, this is subjective. It is still your opinion, your point of likes and dislikes over others.
There is nothing wrong with someone’s view that shows less of a rating over another (or vice versa). Mine might tend to a give higher rating for looks for one type over then next girl, be it race, color of hair, eyes, et. et. (I Love Asians).
The content of the review - in my opinion, fairness in the language or choice or words is more critical in cause for rejection. This is subjective too, not easy to evaluate. And from the TER perspective, totally at the discretion of the individual charged with accepting or rejecting our reviews.
But, if a review was showing a significant shift in the rating, and the reviewer went on a rant about this session, rather then giving a fair reporting by limiting words that would incite most to riot or start a flame war, I believe TER would be responsible enough to accept.
This has verifiable proof, go search providers reviews in the rating level or a 9 and 10. There you will see many who while consistently getting high marks there is always one that lets us know she was having a bad day or possibly a case of YMMV..
You have to keep your mind open along with your eyes when reading the reviews posted, try reading between the lines, then make the best guess if this is someone you want to see or not.
It will always remain a gamble, which you are willing to take or not, and subjective to your likes and dislikes mixing with the providers.
But in her case, she might be having a bad day or worse, forgot to tell you she doesn't see this or that and you obliviously get bad treatment, go back and write a scathing review beating her up with words - only to find it reject later. Was it inconsistent - yes - but that was the freaking point you wanted to express - could you have put less emotion and more objective and fair language - probably.
I am not who I say I am, or do what I say I do, I am a piece of literary fiction, not artful, not inspiring, not funny, not informative, I am a review. I might entertain some, but not all, do and don't judge me on my content and literary skills (or lack there of) I am nothing more then a review, please accept me.