Hard to disagree with this imo...
Based of the testing I've done on PotD I'd have my list looking like this:
1: Cipher, Druid
2: Fighter, Rogue, Priest
3: Wizard, Barbarian, Chanter
4: Paladin, Ranger
5: Monk
Monks in my mind have the most counter-intuitive build out of all of the classes. First of all, they scale poorly while they level because their fists end up being garbage late game. Second of all, their abilities proc of wounds, which require you to get hit. When you're playing in PotD, having a melee DPS get hit that isn't a fighter or a barb with a decent health pool is going to result in their swift death. One would then assume that a monk should tank, but they get completely outclassed by fighters here.