Among the more recent eBay seller protection improvements are some regarding feedback protection. I have had a fair few colleagues reporting that these are working well for them in some cases, and tonight I had one to try out myself:
On this listing:
http://www.ebay.com/itm/Jerald-P-Stowell-Beginners-Guide-American-Bonsai-miniature-tree-gardening-/230920415588
A buyer left neutral feedback, "Not enough color illustrations, overpriced".
The listing makes no mention or promises of illustrations, color or otherwise, in either the item specifics or the description. And, she knew the price when she bought it.
I brought this to the attention of "John" at eBay over the phone a few minutes ago, joking with him that the listing also didn't promise a pony and it would be fairly silly if the buyer left feedback complaining about that, and John agreed and removed the feedback entirely within 1 minute of the end of my call, including any low DSRs this buyer may have left.
eBay can be a difficult environment and no question there are times when we as sellers are between a rock and a hard place, but I like to give credit where it's due, and alert other sellers that if you did everything right and got smacked by the buyer anyway, there is, at least some of the time, some recourse.