To me its waaaay better than Sharepoint - which we also used. And it is way more suitable for "non-technical" and "non-wikisavvy" users than e.g. MediaWiki.
I have never used Sharepoint. Fortunately I do not work in a Microsoft shop. (Though we do have to bear Exchange Server.)
One minor misgiving about Confluence is its syntax: Opening and closing tags look the same. So {noformat} both starts and ends its environment. I haven't done anything fancy myself with Confluence, so I can't comment on the other complaints. (And we do use an ancient version, because we have some custom changes, and nobody has found the time to port them to the new version.)
To me its waaaay better than Sharepoint - which we also used. And it is way more suitable for "non-technical" and "non-wikisavvy" users than e.g. MediaWiki.