I think you forgot to link to the screenshot? As far as I can tell, "category" would be OK, assuming that you give stars in a number of different categories. You have a typo: spurious "I" after "if".
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Perfect StrangerWhich category should I give the seller less stars in if I the product's quality is less than satisfactory?Your question boils down to this: Which category relates to product quality?
CalifJimNothing in your statement says that you are going to give fewer stars in any particular category.It seems clear enough to me that this is the speaker's intention.
GPYIt seems clear enough to me that this is the speaker's intention.By intuition or inference, but the answer to the question remains the same if you ask
Perfect StrangerI didn't attach it last nightIt's just as well you didn't. There are few of us here who can read Chinese.
CalifJimIt's just as well you didn't. There are few of us here who can read Chinese.I can't read all of them... I can read just a few of those characters, but it doesn't really matter.