Eh, I feel like they didn't get it right until Black Panther. For some reason they underpower all the villains in their films, but Killmonger and Thanos were done perfectly.
But see then there’s that unfair unbalance that pisses off the other side.
Cuz when the villains are too strong there are complaints that “well the hero is needed and should be stronger” on the flip side.
Many of the villains have been very strong in previous movies. But people just find other preconditions and caveats to complain, shyt on and dismiss them.
Prime example, Thor 2. Now just talking about strictly power, no character development or charisma or etc other shyt. Just physical or supernatural POWER.
The Dark Elf and his #2 were powerful as fukk and causes major damage to Thor and his kingdom