I love all the differences in opinion!
Its improved. Its not. Its a zero. Its 7 out of 10.
Makes one wonder, yes?
Once you've seen Warlords Deity overrun sizable civs in just three turns, Civ6 patches amount to baby steps.
I gather the point that Civ 6's difficulty pales in comparison, but is Civ 4 Warlords really a good standard for nostalgia? It was basically just carried by its bonuses and the reason why BTS is easier is they actually made a better AI even considering the additional features in the final expansion.
The AI in civ has always feigned competence, though I must say in the last 2 games it can't even do that and it's more of a issue of the player tripping and dying as opposed to actually getting outplayed.
Civ6 Deity gets enormous, previously unheard of, bonuses: its units being better than human, three settlers; on top of traditional bonuses across the board. Its weakness arises entirely from its AI.
I'm not in any way suggesting past AIs were comparable to human. But they were successful in fulfilling their role between their scripting and their bonuses. CIV Deity could legitimately hit early dates on science victory, fairly early on culture victory, could conquer territory/vassalize and eventually win domination victories.
Personally I think Civ VI AI doesn't owe anything to the Civ V AI, so if you can play Civ V and still enjoy it despite the AI, Civ VI won't be much different. The only exception is air combat, it still non-existent compared to V.