I like that Zahn retconned the Lando/Mara romance and mocked it in the Thrawn duology.
I’m indifferent on him also mocking The Emperor reborn and taking a shot at Veitch. When he himself has a Clone of Thrawn in the story we never get to see.
I liked that the Callista romance went nowhere. The Akanah thing was a total waste of time. The Black Fleet trilogy was garbage.
Though I actually like 2 of the 3 Callista trilogy novels.