Does it though? When the guy making them isn't actually
making them?
Because this narrative ends up confusing things if you follow it. Or at least, it gets tangled up with other narratives we like to cling to when it comes to filmmaking. Narratives like "the studios need to get out of the way of the creatives", that when the studio starts putting its thumbs on the story, the story invariably gets watered down and fails. There are truisms about movies that we buy into that don't necessarily carry the weight we need them to when we look at specific films. But it doesn't stop us from propping them up instantly, automatically once something goes sideways.
Feige (who has a name, at least, and is an executive we know does work at Marvel, so that automatically makes him different than almost every other studio exec we discuss via the name of their studio alone) likes comics. So did Arad, actually. And you're suggesting that the movies turn out well
because Feige puts his thumbs all over the stories. Which means that the reason he defies the otherwise conventional wisdom that studios need to get out of the way of the creatives is because
he's a fan.
But Whedon (a really big fan) might tell you that the movie he most recently wanted to make didn't get
really get made because the
biggest fan at Marvel (Feige) kept cockblocking him. And Marc Webb (a big fan) might suggest that because Arad (a big fan) kept putting constraints on him, Amazing Spider-Man didn't get to do what he wanted it to do. However, Tom Rothman (not at all a fucking fan) was in charge of the studio when Bryan Singer (kind of a fan. Ish) turned out X2, which many people consider to be one of the best superhero films ever made.
GAF itself put it in their top 10.
So is fandom
really a factor here? If it was, couldn't most of these problems with bad superhero films have been fixed by letting the creatives and the executives have some sort of fan-off to fix the movie? "Well, shit. I guess you love this comic more than I do. I'll get out of the way then." But that doesn't really make sense, and it's certainly not how movies actually get made.
The importance of fandom in the quality of a project is highly overstated, and a lot of the discussion about superhero films, especially discussion that focuses solely on studios (and the personalities attributed to them like they're actual people), is less about actually discussing the whys and wherefores of what went wrong and how, but is more about reinforcing the idea that good movies get made because the people making them are good fans.
And that's not how it works. Good movies get made because people who are good at their jobs do good jobs at telling the stories they've been tasked to tell. Fandom doesn't really have much to do with it at all. Unless, of course, the metric by which you measure a film's success has more to do with "faithfulness" as opposed to whether or not the story was executed well.