I sell mostly books, VHS and DVDs. Most of my buyers choose Media Mail, which can be slow. While I ship within 2 days of payment, delivery time may take 1-3 weeks. So far I have gotten good star ratings, but I know the "Shipping time" one will be effected by buyers who think their item arrived too slowly because they don't understand how slow Media Mail can be. (sigh).
I really dislike the new feedback system.