Information here seems to be very good. There are a good number of patients with high levels of detailed knowledge, and if something incorrect does get posted, it's quickly corrected in follow-up discussion. Also, thanks to moderators for pruning out the spam.
I have seen forums where quality of information is poor. That happens when there aren't any knowledgeable patients, unfounded claims go unchallenged, some people think they had the one and only good treatment option and so should everyone else, etc. Anyone dipping in to such a forum who knows the topic is likely to leave pretty smartly, so they tend not to get any better with the members sitting in their own confirmation bias bubble.