I can emphazize with your position. At the same time I understand that the dev has built the game and the whole narrative around the villain of the show. It is deeply embedded in how the story evolves. It is probably sad for you, as I feel you would like to play a game about this show, and playing the villain is a deal breaker for you.
If you are open to suggestions, I can say that the villain undergos some transformation during the game, where he accepts his mortal experience more and more and will also become something of an ally to the guardians. Also you can make decisions on whether to play the cruel or nice version of him in many occasions. There will be times when he looks back on past decisions and expresses his regret in light of his change. Maybe this will give you something to play towards, if you can overcome your inital resistance to the idea of playing him.