Aztec just need generic buff. They underperform in treaty and in supremacy. Some pro put them in F tier too (btw usually the tier list stop at D). They are abysmal atm. Part of it is the fact that they lost alot in the age 1 with the nerf to the war chief ability. If he go for treasures, he will be way to low HP to be useful in any way in age2 where you need it for his xp aura to fuel the shipment (which is their economy bonus mostly).
And they didn’t even address the warchief buff like they said in the last patch. That is really frustrating.