If Notch wants good ideas and an awesome community then he should just come here :/
Meh, we still have our spats. I wouldn't say Bay12 is as bad as some other places, but we have some people here that have to have their way or fuck off. There are those here that believe they have some sort of "earned right" to shoot down any ideas but their own based on some perception of self righteousness. We all may fall into that trap
a little, but there are some that take it to extreme levels. (examples: Sifting through someone's post history to find one nugget to use against them... trying to find angles of personal attack. I do X for a living, so I'm right... you cannot be.)
I'm still a little sore from a recent dispute, but I know it happens... a lot. The only way we've remained halfway civil here is threat of banning. We sequester ourselves into like minded cliques. If you find yourself in a thread that doesn't follow your personal feelings you'll soon find yourself overthrown or silenced. There are topics that get logical constructive banter (I think the Religion threads have remained rather civil, for the most part) but that usually doesn't last. There will be people who want the thread closed because they don't agree with the topic and they go out of their way to bend the rules enough to get it locked.
It may not be the same childish crap that goes on in other places around the web, but I wouldn't call this community the pinnacle of human accomplishment.