C. Lee said:
I didn't realize that Val Kilmer, George Clooney, Wesley Snipes, Hugh Jackman, and Toby Maguire(some of the actors portraying superheros between Keaton and Bale) had the same body type as Keaton....huh, learn something new everyday.
I believe Black has the possability to pull off a serious role...hell, I would love to see him tackle a purely serious leading role....but he shouldn't do it as an established comic book character such as Green Lantern.
You are obviously a Jack Black fan....there's nothing wrong with that...until it blinds you from the obvious. He is a short overweight comedic actor....if he tried to make a film about a serious well established comic character...it just would not work.