I read Shannon Hale's Princess Academy in one sitting last night. I can't put those books down!!!!
Let me clarify why I say it's bad, though I'm only half serious. I love to get into a book so much that it's hard to put down. It's so fun to be pulled in that way. But then I'm sad when it's over, wish there were more, etc. And it was bad because I was up until midnight reading it.