Don't get me wrong, I love Flickr. But what really spoils many of the groups is the self opinionated "Group Police", the power crazy administrators who just love pushing people about. Take the group "Comment on my Stream" for example. When you join you agree to comment on other peoples work if you post a photograph. Fair enough, but now you have to leave 5 comments for every post - and I mean "have to". Failure to comply results in a number of stern emails from the "police" with threats of expulsion. Leaving meaningful comments is time consuming and who wants to leave a short "nice shot" comment. But no, the police are on to you.
Lighten up guys, let's drop the rules, enjoy each others photographs and stop acting like a bunch of Nazis!