So Mollom absolutely stinks, as far as I'm concerned.
I just posted this comment on a site that is not mine, but is a Drupal site running Mollom: http://www.istos.it/blog/drupal-training/open-sourcing-drupal-training:
The Examples for Developers project is an open-source training initiative. I'm trying to get it used for developer training and to have books on Drupal development use it for examples instead of rolling their own (which invariably get out-of-date and can't be maintained.)
I encourage you in this (vast) initiative.
And what did I get?
Your submission has triggered the spam filter and will not be accepted.
That's about the fourth time I've taken the time to write a comment on a Drupal Mollom-enabled site, and gotten that kind of a response. How many comments are being rejected inappropriately on sites that use Mollom? Who will ever know?
At the same time, the only site that I have Mollom on, http://hobobiker.com, gets has spam comments approved daily. In fact, it never gets anything but spam comments, and Mollom seems OK with that.
What's up with Mollom? This is not good.