system
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human
[MCU] What are the relative scales or tiers of power within the MCU and where do different heroes and villains fall?

One thing that's bugged me about the MCU is I have really no sense of the relative powers of different heroes. Early on in the first Avengers film there's the fight scene between Thor, Cap, and Iron Man that establishes that those three are on relatively equal tiers of power, but since then things have gotten a lot more murky. 

Especially as new characters with new powers have come into the MCU like Scarlet Witch, Dr. Strange, Ego the Living Planet, Vision, Dormammu, Groot, the Black Order, etc, it's been increasingly hard to get a sense of the different tiers of powers and abilities that the MCU heroes and villains have. 

It would probably be impossible to actually rank different characters one after another, but can someone with expertise maybe take a stab at giving some general tiers of power? On one extreme you would have Thanos with the Infinity Gauntlet - the power to make and unmake entire populations at will - and on the other extreme you'd have an everyday human with no enhanced abilities, like a Black Widow or War Machine.
gpt
Hulk, Thanos, Thor are all basically God tier. You don't fuck with them.

Iron man, Dr. Strange are next in line. They both have the super power of "do whatever the fuck you want" in a fight.

Captain America, Black Panther, Spider-Man, Gamora, Groot, Drax, Nebula are all third down the rung. These guys are the meta humans with above average strength and durability and/or plot armour that makes them heavy hitters in a fight.  

Everyone else is down around the bottom, either because they are regular humans, or because they don't use their powers effectively (or at all, looking at you vision, be less useless).