A lot of people have complaints about eBay. Mine is the fact that they won't remove a negative feedback no matter how much evidence I've shown that it should be removed. Also, the fees kill me, the new guy in charge there has raised them so high and it's just gotten ridiculous. What is your complaint about eBay?
My brother has no trouble with getting negative feedback removed when he gets it. He likes his 100% positive feedback ratio I myself have no complaints with eBay, since I barely use it.
I would say it's idiots selling utter tat on there. My sis bought a charger for her i-pod for a couple of quid, the piece of sh*t looked great but couldn't even charge the i-pod up. And the fools that sell gimmicks i.e a potatoe shaped like a pair of bollocks and other similar crap.
The fees and the buyers that have no idea what they bought. I do like the new interface though, makes it a lot easier to sellers.
Of course ebay has spawned some classics in its time. Check this out. http://www.theregister.co.uk/2006/03/31/ebay_box_sale