1. Too many samples, but not enough explanations. I'll be happy if the author presents complicated topics, as long as he explains them thouroughly. But not here, all you get, is one long-winded code after another, but only a sentense or two to explain what the heck is going on in the code. So usually as I read a chapter, I would counsult another book, so I can have some clue what was just covered. Not an ideal learning experience.
2. Too boring. The author doesn't inject one iota of humor, or any kind of real world examples, or applications for his codes. The explanations are terse and dry, and felt as if, the author doesn't really care, or care to know, that at the other end, there's another person reading this.