I find the various communities to be sharply divided, yes, but only some of them are heavily moderated. On the other side, you just get downvoted into oblivion if you disagree - but at least your comment isn't hidden from those who seek it out. I agree that it takes the fun out of things.
You're very right, and it still sucks. I wish we had a bitcoin community that was less like reddit and more like HN: well-reasoned submissions and replies and moon jokes (we are bitcoiners after all) from everyone are welcome, trolling and flamewars heavily moderated.
