MCU Villains: Why so controversial when criticised?

MCU Villains: Why so controversial when criticised? Dec 2, 2017 7:31:28 GMT via mobile Hauntedknight87 and justanaveragejoe like this

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So Black Panther fights an evil version of himself? Seriously? And MCU fans still try to claim that MCU isn't formulaic?

Didn't Superman, a Kyrptonian fight another evil Kyrptonian? Didn't Wonder Woman, a goddess, fight another god?

Ouchie.