Confluence is the single, worst Atlassian product, in my opinion. I describe it as a wiki written by someone who has never used a wiki. It seems like everything about it is wrong in some way, and it's painful to use.
I've been recently forced to use Confluence and I'm blown-away at how horrible the editor is. It feels like it's a beta-level product. For what it costs I'd expect it to be on-par with, say, Mediawiki and it's just not.
It used to be fine. The absolute worst of the recent changes is that they got rid of the ability to make a link to a new page by creating [the link] in square brackets, and then clicking on the link once published. Now you can only create links through their menu (or a keyboard shortcut), and only to pages that exist already. IMO when that feature was removed it stopped being a wiki.