Ryan Reynolds delivered a performance in Green Lantern that was likely the very best thing about a film that was literally bad on a cosmic scale. Just because Reynolds could squeeze out some small bit of good from this nightmare of a film though, it does not mean that he was cast well. Remember the fan fiction trailer released well before a Green Lantern film was announced? I immediately fell in love with the idea of Nathan Fillion as Hal Jordan and the Green Lantern. Remember how he went from an easy going, joke-heavy bank robber in the beginning of Serenity to a serious soldier bent on saving a bar full of people in a moment? That was great! Now this is no knock to Ryan Reynoldshe does well as a cocky hero type, comedies, and even romantic films, but there is no universe where he should be wearing a green suit and reciting the oath of the Green Lantern Corps. Although he did seem to fair well against a giant evil poop cloud. Who They Should Have Cast: Nathan Fillion