Fang Lair is ridiculous. Ran with a great PUG group this weekend. The menagerie was surprisingly not that bad, especially after reading some of the other posts in here. Hard mode on the final boss was absurd. We had high DPS and a solid tank. We even tried swapping out a DPS for a strong healer. Couldn't even make it to the ghost stage. After 90 minutes, enough was enough.
Upside was nobody went at each other's throats. So we had that going for us. But its so unlikely that you can keep together a PUG that long to beat hard mode
I think it was assumed that this for non-HM. I don't think any of the new HMs are puggable. If you're going to include HM, then I'd say that March of Sacrifices has the worst HM by far.