Joss Whedon wasn’t just given The Avengers to run, he was also brought on to consult with the Captain America script. This gave some people room to speculate that there was something wrong with the Cap script and Whedon was brought on to “fix” it.
Well it seems that wasn’t at all the case. io9.com explains:
Joss Whedon discussed his involvement as a script doctor on this upcoming Marvel film. He praised the tight structure of the screenplay, and said he primarily worked to make clearer connections between characters. As he explains:
There were a couple of opportunities to find his voice a little bit – and some of the other characters – and make the connections so that you understood exactly why he wanted to be who he wanted to be.
I really like how Joss Whedon wasn’t just handed The Avengers and was told to just deal with whatever happened before. He really liked the script for Captain America: The First Avenger, and he just tweaked it with Cap in mind but also, so the transition to his Avengers would work better.
I think with a an ensemble film based entirely on characters we will all have already met, it is important to have collaboration between the writers so they are all on the same page.
Whedon instills worlds of trust for me.