Yeah, the original Zahn trilogy felt like proper sequels to the films. I enjoyed them for decades after first reading them, although I haven't re-read them in ages. I probably still have my old paperbacks boxed up somewhere.
But the rest of the books? Glorified fan-fic. Some interesting concepts here and there, but soooo many superweapons and Jedi powers getting out of control and yet another Imperial warlord threatening the New Republic and blah blah blah. I read from the first Zahn trilogy up thru the Black Fleet Crisis, and then said "These...really aren't very good." The X-Wing novels were, as I recall, the one exception, but I got into those late in my reading of these books, and just kinda ran out of gas before I got very far with them. The stuff I read was: Zahn trilogy, Truce at Bakura, Jedi Academy trilogy, Courtship of Princess Leia, Crystal Star (ugh), Corellian trilogy, Children of the Jedi (ugh), Darksaber, Black Fleet Crisis trilogy, and then a handful of X-wing novels and the Brian Daley Han Solo trilogy (which I actually kinda love). Oh, and I think Planet of Twilight (pass), and New Rebellion (also pass). In those books, there were only a few that were genuinely good, a bunch that were mediocre, and plenty that I was more than happy to give away.
I never read the stuff after about 1997. I'd been reading most of what was released for about 6 years by that point, and just got fed up.
These days, I collect hardcover books because I like the look of 'em better, and I prefer reading them in bed at night, although I also like having a paperback copy I can tote around if I want to read on the go. But I prefer hardcover. Hardcovers hold up better over time, too, in my experience.
And I've long been of the opinion that the way to handle storytelling in the Star Wars series is to kick the story several generations into the future such that the heroes of the OT were practically figures of legend by that point (to the extent they're remembered at all).