As with The Simpsons and Futurama suffer from the problem of having a great setting, great jokes, great writing, and crummy plots, making 30 min. episodes of the cartoons enjoyable, but the movies hard to sit through. Usually by the 1 hour marker in the movies I start wondering why I should care and thinking about going home. Setting and writing grips you and plot keeps you. I've had the same problem with the discworld novels - good setting, good jokes, good writing, but by page 150 I stop really caring about the plot as it doesn't seem that compelling. I suppose I keep reading (up to page 150) of the discowrold novels because everyone know keeps singing their praises and after about a year between books I start to doubt my previous impresions and give the next book a go. Moving pictures was the first discworld novel I was a able to finish completely (aside from the first) and it seems that the series is finally growing on me. I can't think of any other series where I would read the first 11 books before actually enjoying them in their entirity...