Robert Downey Jr., an Oscar-nominated actor with something to prove after well-chronicled drug problems, brought his innate charm and comic timing to "Iron Man," setting the bar high for future actors in comic book roles.
It helped that he was working with a good director with a light comic touch (Jon Favreau) and a good script.
Neither "Green Lantern" star Ryan Reynolds or "Thor" star Chris Hemsworth could measure up to that standard. Nor, for that matter, are Martin Campbell and Kenneth Branagh known for their comedic touch.
These projects are comic book adaptations, remember.
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