As has been said before, sequels can be crazy-go-nuts, both in a good and bad way. Certainly, in some series, the first few sequels are good and the rest aren't quite as. For instance, "The Hitchhiker's Guide to the Galaxy" had great sequels in "Restaurant at the End of the Universe" and "Life, The Universe, and Everything." However, the other two weren't quite as good. Also, the Dune series - the first two were great, but it is the general consensus of everyone I meet that all the books after that are worth their weight in sand. (Hah, unintentional pun.) So, yeah.