I rate Bitrix intranet portal much higher than just a simple enterprise portal software. Its functionality goes beyond the traditional internal communications and I believe is more similar to Enterprise content management systems. It has great document workflow management, business processes automation, extranet capability, media content management, built-in XMPP server and much more.
Despite ECM sounds a bit pompous and usually makes me think about the product price and maintenance, which is not the case with Bitrix. They still keep affordable pricing and easy navigation and administration that require no in-depth knowledge. In my company we don't keep a system administrator and me as a marketing manager do all the maintenance stuff myself with no hassle. At least now I can do all the changes in a minute without waiting for sysadmin to come and practice his IT witchcraft :)