Fun fight. I don't think it's that hard, to be honest. Pretty sure, though, that when I sleep tonight, my dreams are going to be haunted by undead warriors chasing me around screaming "shit, that was a Deaden."
Well while there are no guides as such out there yet, I think the biggest help was just having boss timers available going into the fight. Multiple wipes to figure out the timers and such on the different key abilities would've prolonged the learning process significantly. As it was, I think we saw p3 with ~20 people alive on our fourth attempt or so, and then it was just a matter of the interrupters in p2 getting enough practice to do it every time. I guess with all the hype about how it's such a hard fight, I was expecting more. The interrupters have the only hard job, really.