She was really one-dimensional in WoL. Problem was that they tried to give her the same treatment as Sylvanas, where they go "Oh actually she was just evil because she was under the control of the super-mega-satan villain" and try to sell her back to us as a good person, which is more marvel-fication than waifu-fication if you ask me.

Amon killed the story so hard it's genuinely depressing. An evil so great that it leaves 0 room for any individual motivations or interesting personal conflict between the other characters, we must leave all our differences (and everything else that might make us interesting) aside to unite against this existence-ending threat. An evil so great that, once again, the only reason anyone might be on his side is fucking mind control. An evil so great that he was actually behind everything bad that happened up until this point, retroactively taking away agency and character depth from characters before his name was ever mentioned.

No room for conflict between Kerrigan and any of the Protoss or Terrans whose loved ones she killed, after all, we can't waste time squabbling amongst ourselves while Amon is preparing to kill us all! No room for intrigue between any characters, this is not the time for personal motivations, we all need to follow the exact same goal, doing anything else would be suicide.

I really hate Amon. Like I said, Kerrigan was collateral damage of Amon blocking any character in the story from having depth.