I agree that the book of Enoch is interesting.B. W. wrote: Though not cannon the book of Enoch has some interesting information!
But interesting does not necessarily mean historically accurate.
The book of Enoch is not canonical and therefore falls under the category of tradition as opposed to divinely inspired truth.
And as SoCal points out the origins of the book of Enoch do not extend back to anywhere near the time of the historical Enoch.
Jude's reference to the book of Enoch does present some interesting questions.
I believe Jude is using a quote from a piece of literature that was well known to the Christian/Jewish community as an example to demonstrate a theological truth.
I do not believe that Jude's quote from the book of Enoch implies that Jude is validating the totality of the book itself.
Since the book of Enoch is not divinely inspired Scripture and was written thousands of years after the time of the historical Enoch, I do not think we can presume that the book of Enoch is an accurate historical representation of what occurred in Genesis 6.
I think the book of Enoch does represent extrascriptural traditions that had arisen around the Genesis 6 story over the thousands of years that passed between Moses' documentation of the Genesis 6 story and the creation of the book of Enoch.
And as interesting as I find the book of Enoch to be, I am not inclined to treat the traditions captured in the book of Enoch as either divinely inspired or historically accurate truth.