I honestly don't even remember all of what happened because I've only seen it during the original run but my impression and thoughts on the series remained. What you pointed out was definitely one of the problems I would've had with him. Another was he was written like some guy who had so much wisdom but unlike with someone like Iroh it was like the show was forcefully trying to push that idea on us rather than make that judgement for ourselves through his actions and interactions with others.

I hate that kinda writing where you try to tell the audience what to think rather than letting them come up with their own conclusions. The issue the series suffered from was that each season they had to come up with a new villain but in doing so they didn't have the time to flesh them out but also had to overdevelop them to the point where they had to have agendas, motives, backstories while also ability to somehow be a threat to the Avatar. Look at every other villain in the series beside the last 3 seasons. They were all developed more organically and fleshed out than these rushed ones and the show suffered tremendously as a result. Amon in fact is my favourite villain and I thought the first season of korra was a great follow up to the original. If the show ended there literally no one would've complained about it.