Seems like you're missing a major piece. He's not the sheriff, polar opposite in fact
I stuck it out and finished all four seasons.
First off I did understand the story line with him not actually being the Sherriff. I think you missed my point of the first season being very redundant.
However, the writing got better with each season as did the acting. It was nicely wrapped up at the end of season four.
In the beginning I couldn’t understand how Antony Starr’s acting was so bad after he did such a great job as Homelander, in ‘The Boys’. But his acting really evolved with each season and he became much more believable. It was interesting to witness.
So, overall it was worth watching.