Frankly, I've never liked TER's numerical rating system. So, I've always used a grading system similar to what I experienced during my 22 years of education, and which I later used to grade students' written projects and exams when teaching college and law school courses as an adjunct professor. So here's how I assign numerical scores in my reviews:
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My 10 is virtually perfect, like giving a student 100% on an exam. While one might see a few of those in the looks category in their lifetime, they are extremely rare in the performance category and unobtainable from me on TER because I don't do anal any more nor do I do threesomes in the hobby.
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My 9 is truly exceptional, but just short of perfect. Her pictures are real, or are a very fair depiction of her current look, and I find her beautiful. An A student in looks and/or performance. Somewhere between 90 and 99%. These are rare, but they're out there. The gradations between 90 and 99 would be apparent from my narrative descriptions.
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My 8 is above average. Very good but not great. Her pictures are real, or are a very fair depiction of her current look, and I find her very attractive. She's a B student. Somewhere between 80 and 89% in looks and/or performance. This is my score for a lady who goes above and beyond, but could have done more. Again, the gradations, and things that I thought were missing or could have been better, would be apparent from my narrative descriptions.
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My 7 is for the average looks and performance. A C student. Somewhere between 70 and 79% in looks and/or performance. She meets my expectations but is only average. Her pictures are real, or are a very fair depiction of her current look. She delivers the promised services, but they're just ok. The gradations, and things that I thought were missing or could have been better, would be apparent from my narrative descriptions.
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My 6 is a disappointment for me. Somewhere between 60 and 69%. Her pictures are old, fake, excessively photoshopped, and/or are not a fair depiction of her current look. Alternatively, the pictures are her, but she's gained weight, changed her appearance, or done nothing to make herself presentable for our session. In terms of service, she delivers most of what I was promised (either in her ad, by text, or in her TER profile) but it's below average, lacks passion, and is barely better that a failure/disaster. The gradations, and things that I thought were missing or should have been better, would be apparent from my narrative descriptions.
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Anything 5 or below is a disaster. A failure. I rarely give a 5 or below, but when I do the reasons are well explained in my narrative. The difference between a 1 and a 5 doesn't really matter to me, but for example a 1 would be a rip/rob, and a 5 would be a very poor session. 'nuff said.
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That's how I assign my numerical scores. It's not perfect, but it's similar to what we've all experienced in the American educational model, and it's comfortable to me. Before any rules folks tell me it's not TER's system, I KNOW THAT! But at 66 years old I just have an issue calling anything that's 50% of the scale average, because in my entire educational and professional life someone who delivers a 50% output is a failure to me. If a lawyer lost 50% of his/her cases he/she would either be a public defender or wouldn't have any clients. If a salesperson meets 50% of his sales quota is he/she average? If so he/she works for a company that is soon to be out of business! Heck, bring home 50% of your usual salary and see how your spouse/partner responds. That's my story. Sorry it's so long, but I'm sticking to it!