I have had a fair share of hands-on time with wikis. With that said, I’ve come to a conclusion — MediaWiki inhibits Enterprise 2.0.

I'm with Gil on this. I recognise that MediaWiki *never* claimed to be an enterprise social computing tool and that in many instances it was the bridgehead that introduced wikis inside the firewall, but it isn't really fit for enterprise purposes beyond a very narrow use case. Gil goes on to describe four inhibitors: No rich text editor, no fine grained access control, no document management and no additional collaboration features.