Well…it certainly isn’t based on empirical evidence, so to me it’s bullshit. The idea that the position of celestial bodies have any effect on anyones lives has evolved from our ancestors, who needed to look to the stars to predict if snow will be coming in the next months. Very usefull skill, but it has nothing to do with fate. You are the master of your own fate, not the stars, not the planets.
Astrology is an old pseudo-science that holds it’s value in it’s explanation of people (at least in this modern day). To some people, it is utter non-sense. And yes, mostly this theory is very vague. It doesn’t have a very solid support. There is no pure evidence that this is what everything should be based on.