It is a shame that this book follows such a masterpiece as the Dice Man, as the standards by which it is judged are obviously going to be high. Don't get me wrong, I fell into the same trap, and read the book initially with such enthusiasm and high hopes that it was bound to disappoint. The first book is better, I believe very few will disagree. But that does not mean that the book is not a worthwhile read.
To those that haven't read it, and that enjoyed the first, I say that it is definitely worth reading. The compelling style of writing and the atmosphere Luke Rhinehart creates is very much the same as in the prequel, and I for one was fascinated by the idea of a "dice town", whereby a community of dice followers live together. Seeing this town through the eyes of a level headed guy like Larry Rhinehart was hugely funny and entertaining. I also suggest that you try to see it as a book in itself, as well as a sequel.
To those that have read this book already, and perhaps let it alone after being slightly disappointed with it, I would suggest perhaps reading it again. I certainly found it more enjoyable the second time round.