I always look at condition notes; and I always write them. Most of the books I look for are old and so I don't expect them to be anywhere near new condition. I figure those looking for "like new" are out to sell them on for profit and I've seen it done. If you want new books, or like new go and pay for them on Amazon or similar site.
I would prefer it if condition notes were compulsory on all books, or a note for those uploading complete inventories to say "please contact for condition notes". Otherwise, it's impossible to leave accurate feedback.