I use Joomla for a mainstream community website of mine. The only problems I have with it are speed. Joomla uses so much resources to run. I have tired a few different things to try and speed it up, but no luck.
On another note if your making a community website then these two are great to have:
http://extensions.joomla.org/extensi...calendars/1401
http://www.ijoobi.com/