I haven't hit a real bad one yet.
You must not have read any of The Adventures of Lando Trilogy then. I have read many of the novels so far and enjoyed them all but these are the first books that I can honestly say are terrible. I somehow made it thru the first book, stopped shortly into the second book and will never read the third book. They are that bad.
But back on topic the Thrawn trilogy are my favs too. It's what got me hooked on the EU. I too am trying to complete a full set of all the novels. I believe I may have all the HC books so far(half are in storage so I'm still a little unsure if I'm missing 1 or 2) with their PB versions only if they include an ebook with it. Actually I take that back, I am missing 1 of the 4 covers of the Ep 1 novel. I still need several PB books but with those so easily found in stores, they haven't been a high priority for me to get yet.
I also really enjoyed the Han Solo Trilogy. It was nice to see some backround history of Han and also how he and Chewbaccas relationship came to be. Good stuff.