Jessamyn is amazing at being empathetic when people have issues with the site, but being firm about the actual decision that have been made, without being patronizing (it's very hard to say "I totally understand your concern, but we're not doing what you want" in a way that doesn't annoy people). And she never ever yells at people unless they totally deserve it, in which case they then realize they deserve it. Unless you are a real malcontent (and of course there are a few), it is really hard not to believe that she is genuinely on your side.

By "issues" above I don't mean technical things like "I can't log in" but disagreements about how the site should be run. Metafilter has a official side site called Metatalk that is largely a forum for people to complain about Metafilter. It is a testament to the Metafilter mods that this actually works.