The technology actually seemed to come at just the right time to make the Hulk - Mark Ruffalo was really able to play both characters.
Clark GreggTo go from Jon Favreau for Iron Man 1 and 2 to Kenneth Branagh for Thor and the very different world of Thor, it's about how to adapt to Coulson in a different setting and a different world while, at the same time, still have him be a part of the same world.
Clark GreggWhat I love about Coulson is that he manages to do that and he manages to wrangle the diva superheroes, and really keep a sense of humor about it. And, you can tell that he really loves his job.
Clark Gregg