I agree that Heideggerian terminologies are extremely difficult to grasp. My professor would, Heidegger need to be translated to german first and then to english. But just because his terminologies are difficult doesn’t mean there is no profundity there… I think many of the sessions on him has helped me to experience that. He uses newer words because the older ones have their own connotations. He (along with Nietzsche) is standing against a whole tradition. If you are a great fan of rationalism or empiricism, probably it is difficult to see the beauty of Heidegger. You should be ready to be surprised; not to be completely understood. In a Heideggerain sense, you never understand fully. I am comfortable with that fluidity. I think Heidegger understands best that reality is not mathematics or logic or rational. They are supra-rational (logicians may call them irrational). Fuzzy logic captures some amount of this style of thinking. Buddhist philosophy, thinking of Jesus etc were not either/or type, but beyond that. Read Catuskoti in Buddhism.
I surely agree of the controversy with regard to Nazy ideology. I will read and refer a little more and comment on it..