Good series, reminded me of my experience with TLotR (with the difference that by the time I was an adult and read it I knew whom Zahn is. ) I read 'em, thought they were great, and expected the rest of the Star Wars books to be written by similarly good authors and consequently be similarly good. Unfortunately, the likes of Terrys Brooks and Goodkind followed in the wake of the Professor (actually Goodkind followed in the wake of Robert Jordan, almost verbatim, but that's another rant... ) and a similar phenomenon lay in wait for Star Wars.
Continuing that analogy, I think what's keeping me from really getting into the Star Wars universe is that the backstory is so vast and convoluted it makes the Silmarillion (or, more properly, HoME) seem primitive. It's a good thing (or not... ) for Lucas that he was willing to license so many people to play with his creation and make him money, while J.R.R. and later Chris Tolkien were a lot more protective. Huh, I just realized I joined the Forum the same month Jordan died; how depressing....