Don,
what I think chris means by "fun" is easy to use UI, that makes the "look & feel" inviting, and no matter how robust the system may be, the ease of use and look and feel makes the difference in having people adapt to a new system, and thats the reason, two of the post popular community building systems on the web http://www.postnuke.org/ and http://www.php-nuke.org/ ( I have seen more projects on these platforms and am more familiar with them than OACS, so excuse my ignorance about some of the OACS topics). These two communities have their own BB, but they ended up porting phpBB and some ppl making similar solutions, cause it had superior capabilities than their own BB-MODULE, and with this I am trying to imply there is a lot of stuff we can learn from their friendly UI and implement in OACS, if there are couple of good graphics designers out there and with all of guys' technical talents it shouldnt be that big a project to make better UI's for most of the OACS modules which ppl see, with some good designers and minor changes you can make OACS Bboard much more appealing and the same stands true for more many other modules. The debate on this topic has been great and I think something comes out of it, that would make OACS a far more appealing solution.
~Somik