Dessert Nomad
Adventurer
Archery is game changing in a way that the others aren't because it helps you go beyond your maximum attack modifier, and since a miss is no damage, that's amazing.
It doesn't help you if you're using a melee weapon or spell, so it's highly situational. Also defensive helps you go beyond your maximum armor class, and since a miss is no damage, that's amazing. So by your logic it should be sky blue, but isn't.
The Warlock's spellcasting is too limited at lower levels to be of as much value as regular casters, but their cantrip lets them be on par with Fighters, especially combined with their other spells and/or features.
A 1st level warlock gets to cast from 2 selected known spells six times per standard adventuring day. A 1st level caster from another class generally gets to prepare 4 spells, but can only cast two times per standard adventuring day. This argument that warlock spellcasting is 'too limited' at low levels is simply factually incorrect. And it's even more silly when 1/2 and 1/3 spell casters are in the mix.
The Paladin has some good spells, but the majority of them come online too late. Divine Smite, by comparison, can add a tonne of damage on a Crit, and you can wait until you get a crit to use it.
EK and AT spellcasting is as useful as the Paladin's, maybe slightly weaker offensively, but that's not their primary use.
But their spellcasting was ranked as 'game changing', while the Paladin's wasn't. For this argument to work, they'd need to be ranked below paladin's spellcasting. And, again, Divine Smite doesn't actually work without Paladin spellcasting to fuel it, so if Divine Smite is actually game changing, Paladin spellcasting is too, as you can't have DS without it.
Immunity to disease is an oddball, but is that all Divine Health does?
Yep. Still going to call it game-changing?