After entering a Taobao shop, you'll find a section on the top right corner of the page, showing the seller's rating, ranking, number of listings etc, similar to the image below:
* Click the image to enlarge
Here is what it means:
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The information in the first red circle means the seller has signed the Buyer Protection Agreement with Taobao.com.
The second red circle represents the seller’s total feedback rating. Here is the complete version of Taobao's rating system (the bottom gold crown is the highest rating):
* Click the image to enlarge
The translation of the third red circle:
Item as described: 4.8 52.27% higher than average
Customer service: 4.9 74.59% higher than average
Shipping time: 4.9 72.74% higher than average
The fourth circle:
Positive feedback: 100% Number of active listings: 147
The fifth:
The shop is opened on Jul.18, 2010
Hope this article gives you an idea of the performance of Taobao sellers. Please feel free to ask if you have any questions.