I have found that ''just if'' something you buy on e-bay is Not up to how you thought it should be,
then write to the seller...BEFORE.....sending feedback.I have always used this, as I feel...they 'do' deserve a chance to 'make-good'....Those feedback ratings are important, and I think we should allow that seller a chance to fix any problem .
Bad feedback could harm the seller....and they may not be totally aware, your not happy with the item.
Let them know!! for sure in a nice manner......and wait and see, if they will make amends to you.
e.g.... refund for something broken, or not as you thought. Bad feelings on e-bay spoils it for everyone. Buyer and Seller alike!