I was willing to forgive a lot, because there was just enough good things in it to make it watchable. I even liked the Harfoots which most people didn't. But they botched Sauron, and to me that is unforgivable.
Sauron would not take the form of some random human swashbuckler to try and turn a few elves over to his side. He's an angelic spirit who decided to go over to the dark side and serve Morgoth. I understand they couldn't use the name Annatar in the show, but they still could of used a similar storyline. He deceived everyone posing as an emissary of the Valar, not as some unknown king of men who gets in bar fights & throws around one-liners. That would be so beneath someone like Sauron.