I have the same mindset with Disney Star Wars, anything that Disney released involving Star Wars isn't canon to me.
\/\/\/\/ This should've been imo Episode 7,8,9, not that mediocre, poor, bad sequel trilogy
I have read the Thrawn trilogy books and I like them.
Compared to a lot of the Star Wars books that came after them they still hold up very well, if perhaps a little too wordy.
And Thrawn is a little overcapable though that is part of his appeal.
For me the only books (ignoring comics and games for a moment) that are on relative equal standards are the Hand of Thrawn duology books, also by Zahn, and the Han Solo Adventures by Brian Daley (I wish the man had written more, and that he also had written Indiana Jones books)
I do think Zahn should have resisted of making Thrawn more 'nice', being more ethical/morally than some of the other Empire characters in an effort to make him a 'good' Imperial.
I also think that it would have been very difficult to turn the Heir to the Empire books into movies, the stories are simply too long for that.
Cutting and editing would have to be done to fit each book into a movie of perhaps two hours.
A series would have worked better in this case.
If I had been put in charge of a Star Wars sequel trilogy I would probably also have focused on the 'next generation' but with Luke, Han, Chewie, and Leia returning in secondary roles.
I would probably also have done something with a daughter of Luke Skywalker (I had this idea way before The Force Awakens), being Jedi student in the academy run by her father, but she would definitely not be a Mary Sue esque character.
She would have some flaws and limitations, perhaps good at being a Jedi, less at being a pilot for example or mechanic.
I would like to have paired her with a New Republic pilot, and later a young Imperial officer from the Imperial Remnant the New Republic now has peace with, the three having to work together to stop a new threat to the galaxy.
What that threat would be I do not know. It would not be the Yuuzhan Vong and I am also not that set on bringing the Sith back even if new Sith lords appearing would make the most sense, perhaps this time having a massive Sith army of their own. (feels too much repetition from the books, and the Old Republic MMO)
I do realize that a lot of this sounds similar to the parts of the later books in the old Star Wars EU. Luke's daughter being similar to Jaina Solo, the young Imperial officer being Jagged Fel (son of Soontir Fel), but that is probably because these concepts work very well.
Then again, prior to selling Star Wars and Indiana Jones to Disney, Lucas wanted to use characters from Star Wars Legacy.
In a way it kind of shows how Star Wars has restrained itself with some of its own lore, that is why I like earlier Star Wars a lot more in which the universe wasn't so 'hard' established yet.