I gave the ebay app a try on my ipad today. I noticed that seller feedback percentage, which on the website is displayed clearly in the search results, has been completely buried no matter which view you change it to.
If you want to see a seller's percentage, you have to go into each item on the list and scroll to the bottom.
Since feedback percentage is the first thing I look at when buying stuff on ebay, this has rendered the app completely useless to me.
I don't expect them to change the app just for me, but it would have been great if there was somewhere I could have left feedback. I have found no such link.