If not harder, it's roughly on par with Weeping City. I'll say this much, you'll certainly be healing a lot right now, what with people still figuring it out. :p
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Speaking from experience, Mhach was very much a healer's 24-man. If your heals were bad or stood in bad, you had to hope another alliance healer was thug-mode and could keep your group up or you'd just wipe. Tanks COULD cause wipes, but things like crap positioning on second boss adds or weird spinning hijinks on the last boss could be healed through if the healer was boss enough. Meanwhile, if your heals never figured out Megadeath or constantly got Ozma push-back into orbs there wasn't crap-all you could do as another role but just keel over and die.
Man, those were the times.