Since I'm getting requests by people to recommend the easiest Set Dungeons to do, especially for the Seasonal Journey, I've gone through each of the classes and ranked them based on my own personal experience. Note that depending on how comfortable you are with the class and set, as well as gear and RNG in the Set Dungeons, your experiences may vary!
Can I make another request? Since you've done all 24, it would be interesting to have a dedicated thread (in General Discussion) where you rank all 24 of them. Because people have to pick 8 set dungeons for the mastery, I'm sure many would be interested in that. For example, I did all 4 of the WDs and then wanted to do all 4 of the wizard, but found that 3 of the wizard dungeons are similarly annoying as the Jade dungeon (only Tal's is really easy). So I'm postponing that til a later date ;-) Then I've read about how easy the barb dungeons are and regret not having picked up more barb loot when I had the opportunity.
Care to make such a thread in General Discussion? At the end, you could link to all your 6 class threads, and in this thread I'm sure other people could discuss what they think their ranking is - as it's probably not the same for everyone, and also differs when you accept help from a friend.