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I've been working with XOOPS for more than 2 years now, i've done some work with drupal too and a little with wordpress.
I still like xoops, because i easily can make a module and it'll work without problems, unlike drupal which has hooks and you are limited in actions you want to succeed in.
Wordpress is generally aimed at blogging so it does the job perfectly, but when it comes to integrate something more serious than one php page, it's getting hard, so is making plugins which basically are intended to bring more possibilities to posts/comments/pages and cannot be considered as stand-alone modules.
BUT both drupal and wordpress use AJAX, which makes user experience so much better! it's almost like pleasure! XOOPS seems to me very old-fashioned, although i love it for development freedom and stability i can count on, unlike drupal.
I suggest implode AJAX tools heavily into core!
redirect messages -> ajax
comments -> ajax
pm -> ajax
ETC.
make it more up-to-date, WEB 2.0, dynamic
and add effects.
where's my red bull!