"The Nephilim were on the earth in those days, and also afterward when the sons of God came in to the daughters of men, and they bore children to them. These were the mighty men that were of old, the men of renown." (Gen 6:4)
Very interesting I'd say...What could have caused these men to be known as the "men of renown?" I think those that write stuff like this off to quickly are motivated by fear of being called kooks.
For what it's worth, I agree with you.
I have read most of Sitchin's books and, while I'm skeptical, they raise many fascinating questions.