I've added to a couple conversations on Facebook lately that have focused on the communities of different MMOs since the passing of CoH.
The main point seems to contend that no communities have been as good as the CoH community, but there doesn't seem to be much discussion as to why. One conversation did try to figure it out recently, but most of it has been revolving around "Yeah, you're right!" and "No way, I don't think so."
My own experience is that I have not found a game that had a communication system as robust as City of Heroes. Not even games that were designed after City of Heroes. Sometimes, it seemed like the chat system was added as an afterthought (especially after the hoops one had to jump through to edit the one on TSW).
Now, I don't know what goes into the making of a communication system, but we definitely need something that isn't just all of our combat, rewards and chats being regurgitated at us in all the same color. Even games with a major studio behind them were doing that. City of Heroes at least let us divide stuff up by different tabs at first, and later we were able to change the colors of our different channels. We wound up with a visual shorthand so we could glance and see where conversation was coming from and do a quick note on whether it was something we really wanted to pay attention to. That's really helpful when you're in the middle of a fight.
So, I guess my question is, what kind of communication system are we looking at?