Yes, mostly with sellers grossly misrepresenting products. If a seller doesn't ship something you paid for, ebay/paypal can be helpful. However, with misrepresentation they tend to side with the seller unless you can prove that the seller lied.

If you have doubts about a listing, ask explicit questions before placing a bid. If photos are blurry, that's a red flag. If someone does a "quick listing" from their iPhone, don't be afraid to ask for larger, clearer pictures. Ask for measurements, ask for a physical description, anything you can think of. If the seller offers to mail information to you directly if you provide an email address DECLINE THE OFFER. Ask that they update the listing with the info, otherwise ebay will not take it into account if you end up filing a claim at a later date.