There seems to be dozen of CMS users:
* Marketing (free form, reporting, link management)
* Document Management users (structured, access management)
* Store front aka E-Commerce (structured)
* Simple Company Site (blog/wiki)
What I routinely see is CMS' that try to solve all these problems. OR the CMS is basically just a platform/library which really doesn't help the end user.
Part of this is what caused me to start http://snaphop.com which is a mobile campaign management (cms for marketeers) instead of the general mobile content management which has the same problems above except for mobile.