Their challenge has been creating new characters that we actually care about. I lean more towards the Dark Side and they haven't done a great job of giving us new Sith that are fun and menacing. My bar is usually "Is this guy as cool as Maul? Or as dangerous? No? Then why am I here."
The Nihil are pirates. And you know, I liked Hondo. He was cool and all, but he didn't scare nobody. If they are going to do something with the High Republic, they need to work on their villains.
I think it would be a neat idea to make a show that's basically Imperial propaganda where it's from the pov of a cast of Imperials, maybe using Saw and the Partisans as the primary villains or something. It would be a neat thing to make the heroes the bad guys.
I prefer the idea of "gray Jedi" but more in the sense of what Baylan and Shin are, they don't really seem evil, definitely not Sith.