Obligatory Difficulty Discussion: The Weeping City of Mhach
I'm actually really happy with the balance and difficulty of the Weeping City at the time of launch. My first attempt was a few days after it was released so most of the party was new, but we still managed to defeat each boss. We did, of course, have to stop for a quick strategy discussion before jumping into the fight, but I actually really appreciated this; it slowed the pace down from the typical face roll into what a 24-man raid should be, a cooperative engagement.
Then we got to Ozma. I love this fight. At times I've felt the way SE designs 24-man fights to divide players into discreet groups to be a bit ham-fisted, see Cetus and Irminsul/Sawtooth. In my opinion, Ozma was a great way to divide the larger party into smaller groups. There's micro-level strategy the individual groups have to deal with that also have macro-level implications; genius.
TL;DR: Weeping City of Mhach is well balanced and well designed and I hope to see more content just like this.