Yeah, opusdei, I think the Watchtower is so ignorant when it makes these conclusions.
It is so simple to merely do research in Judaism or to consult something like The Jewish Study Bible and get a glimpse of what type of Jewish thought went into what is now considered as Holy Writ.
What amazes me the most is that the Governing Body doesn't do this at all, nor do their assistant writers. The issue of blood, for example, comes from the common ancient butchering system common to most people of the Mesopotamian district. "Sacrifices" were really the "butcher shop" of the Hebrew world. Slaughter of living animals was carried out in a humane way, with "offerings" of blood (a symbol of life) given back to G-d. This is easily learned as it is a very basic concept.
This was just an ancient way of Jews "telling" G-d: "We know this life comes from you. Thanks, now let's eat!" We Jews haven't rebuilt the Temple because, among other things, we recognize this was just the ancient "meat distribution" system set up in ancient cultures. We have Kosher butchers now or, for those Jews who don't keep kashrut, the corner grocer will do. We now give thanks at home, before and after meals. The altar before the Temple is a relic of a very ancient past.
The blood issue was still alive and well in the first century merely because many pagans and heathens still prepared their meat this way, as an offering to a god. That is why you have the information written at 1 Corinthians 8.7-10 and 10.27-29. It still bothered some Christians that meat processed by Gentiles was prepared in a ritual that thanked the local god for the life of the animal.
In short, the JWs are off because the issue on blood is about thanking the right G-d for it. Animal products processed at the Temple were acceptable, but those that weren't raised questions. Also, the expression about "blood" in Acts 15 as I believed I mentioned before in one of Terry's threads, is a reference to the Noachian Laws and a prohibition against murder. It is silly to compare all of this to life-saving blood transfusions.