You make a good point. In reality, there are a great many religions that have strict rules and regulations and there are some that feel as though they are the only organization or group that "has it right."
Right now there are message boards out there with just as much traffic in them with ex members of other religions.
The JWs stand out for one reason above all of the others.
Human sacrifice.
They will tell you that it's not called that, but that is exactly what the blood issue encourages.
The Society frowns upon the pagan practices of ancient civilizations like the Aztecs (among other civilizations) who had rituals where they would sacrifice men, women, or children to pagan gods. "Barbaric" is a word I think they have used to describe the practice. Yet their Jehovah deity expects the same thing under certain circumstances.
er