I already started the ZM feedback post: Zereth Mortis Feedback - Community / WoW Community Council - World of Warcraft Forums (blizzard.com)
which has been going great so far, and I plan to keep adding feedback to it.
I’m also looking for a place to add my comments on The Jailer’s Gauntlet, it was a lot of fun to play through.
We also have the Raid Feedback post, and I’m hoping to get into some solo shuffle and PvP this weekend so I can add my thoughts there.