In the grand scheme of things, its not that big a deal when someone writes a book, you like it, and then they write a sequel which -- well, sucks, more or less. Like Oh, crap, I have to write another one? Um, let's see, what did the first one have, lets do more of that, only like MORE, lots more. And maybe no one will notice how thin the plot is.
Then again, perhaps it just happened. Certainly, for the first, things went reasonably well for about 75% of the book, and then the lead character, who always had these semi-magical gifts, now had MORE of them, and was stronger, faster, smarter.... so maybe it was just hey, thats the trend. And if I write a third book, the character will be able to fly, and to bend steel in her bare hands.
Whatever. It's depressing. Because I liked that first one.