The Loneliness of The Avengers

This article talks about how most superheroes are alone (like batman and superman) but that the Avengers have each other. Joss Whedon though says that the avengers are going to be "about people who are alone – because I’m writing it. [Captain America] is kind of the ultimate loner in that way." Captain America is the main piece as the film will be through his perspective. I just thought this article was interesting because I've never thought about the superheroes in that aspect of being completely alone or in this case, being alone but with each other.