So it will suck, not only because it is Green Lantern so without a huge budget you can't do it justice, but also John Stewart is not solo leading man material, I loved him in Justice League Unlimited and the comics I got, but he always had other protagonists around him, in fact he is at his best when he is with Guy, Hal and Kyle Rayner. Honestly I feel like only Hal and Kyle can be solo leads imo, Hal because he is the og space Green Lantern and has the most depth, and Kyle because of his artist angle making him pretty interesting.