I really enjoyed King's Fall. I have 200+ completions and still hop in there and play through it. Wrath of the Machine, on the other hand, I have 20 something completions and after my first Aksis challenge completion I didn't care to ever play it again. It always felt like we only ever failed to player stupidity, not mechanics or difficulty. King's Fall could be forgiven due to the number of things you had to commit to memory or strategies. Whereas Wrath of the Machine is very straight forward. Don't get me wrong, I still think Wrath of the Machine is one of the best raids they've made, as far as action and inclusiveness are concerned. You aren't pressured in to "must have" scenarios with weapons and it's relatively short. It reminds me of an easier VoG without the dumb and very drawn out Oracles encounter. I loved Vault of Glass. I just wish it was more popular to play.