I liked the concept of Thrawn, and didn’t mind the character per se. I just didn’t enjoy how he was written to just be able to get a five second glance at half a painting from across a room and be instantly able to figure out how to totally annihilate his enemy from that. He was never wrong, and almost never made a mistake. I also thought it was dumb how Pallaeon (who was made out to be a very intelligent commander) was always dumbfounded by whatever Thrawn did and was always shocked and amazed and in awe of Thrawn’s every move.
There would be scenes where the Rebels are winning and Pellaeon is like “Oh shit we’re boned!” and Thrawn would just cock an eyebrow and wait until the last second, and suddenly the entire Rebel fleet would implode and Pellaeon would stand there with his mouth agape while Thrawn casually talks about how he laid this one-in-a-trillion trap that he knew the Bothan commander of the Rebel fleet would fall for because of XYZ aspects of Bothan art.
It was just too much over-the-top Mary Sue-ery for me.
But, if they dial that back and just have Thrawn be a very good Imperial Grand Admiral, even if he still analyzes the enemy through their art (which it looks like he does), that would be pretty cool.
I’d certainly love for more original characters, but people have a serious hard-on for Zahn’s books, so this was going to happen from the day they announced Legends, so they might as well do a good job of it.
I can’t make the “He’s finally real canon” argument because it’s not mine and I don’t get it either, I’ve just seen people excited about it.