I describe it as a horror because I, personally, find it a nightmare to use. I get the distinct impression that my user experience is a common one, and not limited to end users alone.
Is the replacement service for the now defunct 'Communities of Practice' a retrograde development? It certainly seems like it to me.
I'd be interested in exploring other users' experiences of Knowledge Hub - from an end user and, if we're lucky, the administrator/moderator perspective should such a user be able to participate in a discussion.
If we're unable to help each other directly then perhaps we can build a body of 'evidence' to feedback to the service provider in the hope that they'll take heed and do something to improve the service for the benefit of all users.