It’s common to lump the plugin together with the documentation. I think a more positive outlook is that in the time it takes to write these reviews, users can share what they learn on our codex, and improve the documentation for everyone else. Better to do good than be critical, imo.
External resources are something that takes time to fill in. If you’re not comfortable opening up the code and looking around at the documentation in there, that’s totally okay — I don’t usually go digging around the packages installed in OS X either, so I understand how you feel there.
Regarding documentation/users/experience/etc… Trust me, I totally understand. I’ve presented on the very idea at WordCamps and other conferences, it’s just a constant work in progress. Some people enjoy helping out, and others like the convenience of everything being available to them right off the bat. I like both in certain conditions, and with WordPress plugins, I generally enjoy giving back and being helpful.
Your rating doesn’t sting; you’re completely entitled to your opinion, and we always welcome the feedback, positive or negative. Hopefully you decide to give it another shot later, and if so, I’m sure our community of users would appreciate the opportunity to learn from your experiences with bbPress.
P.S. – I’ve updated the codex page in question to be more clear about the theme name and location.