Three-tier Taobao grading:
好评 hǎopíng (positive),
中评 zhōngpíng (neutral),
差评 chàpíng (negative). Sellers obsess over
差评 — a few can tank a listing. The underground industry of
刷好评 shuā hǎopíng 'brushing positive reviews' (paid fake reviews) exists because of how much
买家评价 matters.