Here's a breakdown of what I've very recently learned, and I have to admit, it's pretty interesting. It's true that soybeans are soy in a pure state.
However...it's best to eat soy products that are fermented, like tempeh or miso, because the fermentation process neutralizes the phytic acid.
Phytic acid is found in all beans, but in very high quantities in soybeans. Too much phytic acid actually causes malnutrition if ingested in too high of quantities.
I prefer to use tofu as a treat now, and I really try not to buy any fake meats, sausages, or fake deli meats, etc. I don't think processed foods are all that good for you. I think that many people have the argument that our bodies are not designed to digest meat, yet they're eating up all sorts of processed soy foods. Well, our bodies are REALLY not designed to eat that stuff, I don't think.