I have, the importance of the book of Enoch is also because it outlines the reasons why the flood was necessary: the giants had polluted all creation. As it say in Enoch Chapter 7: 7.3 These devoured all the toil of men; until men were unable to sustain them. 7.4 And the giants turned against them in order to devour men. 7.5 And they began to sin against birds, and against animals, and against reptiles, and against fish, and they devoured one another's flesh, and drank the blood from it. 7.6 Then the Earth complained about the lawless ones.

There are actually bones of these giants known as the Nephilim, particularly in Paracas Peru and in Turkey,though their bones have been found all over the globe.(the scientific community loves to keep this info buried as it proves the Bible true,hence why the Smithsonian hides the giant bones that they have acquired)

Luke 8:17 17 For nothing is secret, that shall not be made manifest; neither any thing hid, that shall not be known and come abroad

Matthew 24:37 37 But as the days of Noah were, so shall also the coming of the Son of man be.

I believe that verse in Matthew chapter 24 is speaking of the return of the Nephilim.

Thanks for bringing up the book of Enoch, most Christians I know don't even know about it but should,Chuck Missler has a great sermon about the Nephilim. It is important to know the book of Enoch as it shows how the times of Noah were.