I disliked The Truth on first reading, and it took me a long time to go back to it, when I liked it a lot. In retrospect, the issue was that this is one of the points in the series where the tone shifts and I didn't want/like it. Going back when I was used to that tone I could appreciate the book without it getting in the way.

The other thing that I disliked a lot on first read was William, because I found him self-righteous, albeit often right, but of course having read the ending I got more of the point of that, too, and the way that Pratchett undercuts it, because of course Pratchett is as cynical about the self-appointed virtue and uncompromising truth teller self-image of journalists as he is about everything similar.