You can review many (x10) treads on this subject on this or other boards. The comments will always be similar, ranging across the whole scale from love to hate. (Did I mention that they are female?)
Putting it simply, they are an itch that, once in your mind, must be personally scratched. You will never arrive at an answer that permanently satisfies you by reading or by listening to others. Once that itch snuggles down in a corner of your mind it can only be dealt with by personal experience... then you'll know, and will probably never change your mind. They just seem to inspire an emotional response, one way or the other. (Did I mention that they're female?)