Alibaba products are always rated 5 stars because its evaluation system sets a relatively high threshold. Sellers must meet certain service and quality standards to get good reviews and high star ratings. In addition, Alibaba also encourages sellers to run their own stores well and provides a variety of activities and rewards to allow sellers to better serve buyers. Alibaba will also supervise and assess the service quality of sellers to ensure that the quality of goods and services meets the standards. Through Alibaba's evaluation system, buyers can better trust sellers and improve their sense of security and satisfaction in shopping. At the same time, sellers are also under greater pressure and motivation to provide better goods and services. This is also an important factor in Alibaba's success.