It's cool to have because it does a much better job showing you how it is than telling you can. The way the new zone feels very much like the place before it got ruined, to the point where there's even places that were lost in the Outland version. And man, the elekks and talbuks in Shadowmoon make you feel sad for how much was destroyed and how only a few basilisks can eke out survival in the Outland version of the zone. Very much an elegy for a place destroyed when you see them side by side. Head over and check it out.