I don't know, the difference between the other Marvel movies and The Avengers is Joss Whedon. He tells good character-driven stories in a sci-fi/fantasy context, so I am looking forward to it.
Really? You really think his FILMS are good?
Let's take a look shall we?
Buffy the Vampire Slayer (the film, not the series)
Alien Resurrection
Speed
Waterworld
Twister
X-men
Now fans of Joss (as well as the man himself) will say that directors and other writers monkeyed with his original vision. That excuse is getting old though. All these years and the only good thing he's ever produced is Buffy, it's spinoff and firefly/serenity. Everything else he has a hand in turns to crap. I'm rooting for the guy because his good work is REALLY good, but he's starting to look like the Next George Lucas.... famous for one and only one fantastic thing.
Even assuming that it isn't excuses (and that very well could be the case) what would lead you to believe that they aren't going to have idiot directors, producers and movie making types monkey with his vision and ruin it like they have with virtually every single film he's ever wrote?
The problem with these types of films is that the budget is too high, so the studios constantly pester the individuals who are supposed to be in charge to change things based on their non-sensical monetary concerns. Of course the catch 22 is that most super hero movies would be terrible without a high special effects budget, so there you go.
I've gotta say, this new wave of super hero movies has been really terrible.... mind you most of them are watchable, but that isn't exactly high praise. I think the second Hulk film did a really good job of capturing the theme of the old tv show and the comics, so I would say it's a success. The second (not the first or third) spiderman was really good as well. I would say that the first was also pretty good except for the fact that their interpretation of the goblin was so lame. It's a common problem with these new super hero movies.... they spend so much time pumping up the hero that the villian isn't even secondary. It ruined the fantastic 4 films, the last two xmen films, the iron man films and the green lantern film. People should look back at the Tim Burton Batmans.... the ONLY successful superhero adaptations of popular characters. They had powerful villians, a powerful setting, and writing that wasn't merely good, but matched the theme and pacing of the comic the franchise came from.
You guys also worry me that you are looking forward to films that you expect to merely be "good". That's a sure sign right there that the bar has been dropped REALLY low.