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.
One of the best is 'The Dark Knight Returns'. It presents an aged Batman coming out of retirement in a gritty, alternate future of the DC Multiverse. It's a story that challenges the traditional view of superheroes and their place in society.