Thrawn was a Marty Stu.Honestly? Love Heir to the Empire, but I think the Rebels take on Thrawn is better since his interest and understanding of art and culture how it can apply to military matters is more complex and personal than "species X made art Y therefore they will do Z".
The thing that makes Heir to the Empire really good to me is loser girl Mara Jade, Thrawn ain't shit.
