I read somewhere that Hoodoo is an ever-growing magical practice, since it's a amalgamation of different traditions coming from diverse continents. And from what I've read in this particular book, Ms. Alvarado seems not to have allowed the practice she grew up with to stagnate and become stale. She let it grow and thrive by borrowing from New Age and Wicca, along with the conservative stand-bys from Asia, Africa, Native America, Europe, and the Middle East. Normally, I would have considered this a bad decision, but she did such a good job blending it, I became impressed.
New Orleans Voodoo would certainly give Wicca a run for its money, since Wicca has lost a lot of what made it attractive by focusing so much on the conservative religious part, at the expense of the magic. Also it retains a lot of that cultural feel that, at least, American Wicca has trouble retaining.
I may not technically agree with the "what ever you send out will come back to you times three" or the "karma" caveats she added to her advice on building voodoo dolls and such, but I do agree in general principle of what she is trying to communicate, that backlashes do happen when you mess with the equilibrium. Things you don't want to happen sometimes do end up happening anyway...and it's not always good, even with the best intentions. You could have the "monkey's paw effect" if you're not careful, so it's better to learn as much as you can about subjects like this before you start working with it. Nature will rebalance herself, and she can be merciless, so just be aware of what you're doing.
Overall though, I found this a very enlightening and educational book. Very good.