Maybe it is just me not being picky, but I personally find the signal to noise ratio on this list quite positive.
Which does not mean I agree with everything on it, nor even consider all messages on it useful contributions, but even useless verbiage can impart useful signal about the state of the general community.
I think it is important to also note that for any given number of readers, what people consider good mailing list content, the selection is likely to widely vary. For my own part, for instance, even though I think we could do with more measured critixism, "negativity" in itself is not a communication category that I would wish to see gone from this list. Nor would I in fact wish to see advocacy and boosterism gone from this channel, even though personally I do not generally such particularly useful additions to the discussion on this list, _for_me_ personally.
This is not a "brainstorming" channel, but a place where we have to look at things in detail, and with discernment.