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Every CMS\software has its specialties. Depending on type of site, needs, etc. one CMS may be better suited than another. Just depends. They're all great works & I'm humbled by the work all the devs do, Thank you!!
In regards to Drupal, Joomla, Xoops... I run them all in various situations, each with their strength & weakness. Oh yeah, XOOPS is definitely moving along, check out some of the Dev postings. It could be perceived as slow maybe, but then again XOOPS has an extrememly mature & robust foundation already. In my opinion, some other CMS are developing so rapidly to fill in gaps of functionality they don't have.
Personally, for most scenarios XOOPS usually wins out for me; It has great modules available, decent usergroup ability, community building ability, ecommerce ability, documentation, themeing, etc. The balance and foundation is strong, and the newer stuff coming is just improving on that.
My Joomla & Drupal projects take a lot more time. Joomla has horrible usergroup ACL, (lack of), no excellent natively integrated forum (although Joomlaboard is getting there); Drupal has excellent usergroup ACL, lacking in other areas. Just depends on what you need.
2.0.13.2 is the recommended starting point. 2.0.14 will be available in the very near future from what we hear. The nature of open source is always interesting and spicey. Jump on any Jommla, Mambo, Gnome, KDE, openSuse, Fedora, etc, etc., development mailing list and you'll see loads of disagreement, debate, ocassional exodus of people, pouting, ego's...it can look pretty dismal at times, but big picture is all these long term projects are still around and developing because it's that rich diversity that keeps them evolving :)