Yes the "feature is" when you add the image using the WSIWYG editor. I believe it's like bbcode or it does use bbcode. One or the other..
I could just comment on any given advertisement and set [img ]foo[/img ]
Then if that image is bigger than 1000 pixels it looks strange. Especially so with the sidebar on globally. So I turned off the sidebar globally and it looks better now. If I turn it back on then it is much easier to realize the issue.