At least The Crystal Star is bad in a sort of hilarious, I-can't-quite-believe-what-I'm-reading sort of way. I've had trips to the shops that are more eventful than Ruins of Dantooine. Literally. Nothing. Happens. Whatsoever. Also a contender for me is The Approaching Storm, in which several interesting things happen and the remaining 250 pages are spent describing various plants and animals. Also, Anakin sings at one point.