I'm skeptical about it personally. For it to work I'd have to believe that something about the relative position of the planets and our Moon has a physical effect on people. If, say, some type of radiation that entered our solar system from the outside was modified in some way, so that each planet adds or detracts from this radiation in some way, and that intermix affects the just-born individual, then I could buy it. And that's not to say science won't be able to verify that. It could happen, so they (believers) could be right.
I agree with Robdar that if someone's beliefs don't make them a danger to me, my loved ones, or anything else I value, and any harm done is to the believer alone, then it doesn't matter to me what they believe. This is my interpretation of what she was saying in her post.
I haven't made a habit of reading my horoscope. And it could be argued they're written so vaguely that almost anything could be read into them. I'm beginning a study of Tarot cards to decide for myself whether or not there's anything to it. Looking forward to it.
Just my pre-tax $.02.