Hi Kitty - You are right, Auctiva's editor is very lame - but since there are so many good, and free, image editors out there, what does it really matter? I don't view image editing as a hassle, but as an opportunity to take even a poor raw camera image and 'magically' turn it into a knockout photo that will motivate someone to buy my items over someone elses. For me it is fun and satisfying.
If you want minimum involvement however, autofix is often a good solution and is found on most editors. I do not use autofix myself because I can almost always get better pictures by manual editing, with very little extra time involved. As booklady mentioned, Picassa is very easy to use, includes great album features, and is free from Google.
To me, Auctiva's editor is irrelevant. I haven't used ebay's editor, but with all the great alternatives out there, you might want to try some out before deciding to ditch Auctiva.