Welcome to the site! Nice to have you here with us.
Personally, I would not rely on the feedback as my only means of telling whether a supplier is good or not. Although it may help a bit to see one with good feedback.
You must remember that a feedback is oftentimes subjective and would be hard to verify unless you personally know the person who left it.
Try doing your own background research on the seller, find out as much as you can - like try calling or emailing with the supplier and see how they respond as well as their response rate.
Also, always remember DO NOT buy any brand name items on DH Gate and do not agree to do off site transactions unless you have dealt with the supplier several times otherwise you will not be covered by escrow system.
Hope this helps :)