Well, it's a crucial part. It kind of mended the broken parts of the Green Lantern narrative. It cleared up a lot of the convoluted plotlines that had developed over time. And it was a way to get fans excited about the Green Lantern again. By focusing on the rebirth of Hal Jordan and his connection to the power of the Green Lantern, it re - established the core of what makes the Green Lantern stories so great. Plus, the art in the graphic novel was really cool and helped bring the new and old elements of the story to life.
It depends on your taste. Some people love the imaginative universe and complex plots of Green Lantern comics. However, if you're not into superhero or sci-fi themes, you might not find them as good.