I've known this story before i read the book, from wiki and videos on Youtube but then i read the book and WOW it's far better than watching videos or reading wiki.
Ainulindale was beautiful, nice opening to the lore, then the first chapters of Quenta Silmarill were a little bit slow but I enjoyed it anyway then as i moved on to the next chapters, they got better and better. my favorite chapter was and still is Akallabeth, it was surprisingly grand and awesome.
However, this book is not for everyone, like i said before about the first chapters. but once you In to the story, it's one hell of a ride