(I'm adding this comment, placed on this post by another blogger, who I think has a valid point to add to the conversation)
As a writer, you seem oddly reluctant to discuss the elephant in the room with the Avengers Film - the terrible writing. It's a classic 'everything but the kitchen sink' assembly and none of it hangs together at all. It goes way past double mumbo jumbo and into the realm of tabloid weird. Clones, a teddy bear gang AND a weather machine? You can't just dump random elements into a plot and hope it works. As zany as the series was, it confined itself to one kind of zany at a time. A film is longer than a single episode of a show, but the rule still applies. There's only so much absurdity an audience is willing to accept at once.