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.
Definitely not. John Diggle and Green Lantern are distinct entities in the comics. Green Lantern has specific powers, origins, and adventures that are separate from those of John Diggle.
Well, to read Green Lantern comics, first find a source like a comic book store or online platform. Familiarize yourself with the main characters and their powers. And don't rush, savor each panel and the overall narrative.