Well of course that's what you think of The Aviator. But just how did it provide limited insight into Hughes? And are you seriously suggesting the film only teased at his mania? A man overcoming his demons? When did you last watch the film? Surely you don't think Hughes' bid with the Hercules and Senator Brewster somehow depicted him overcoming his demons. The film ends with him still tormented and crippled by the demons that have plagued him throughout the whole film. I can understand how you could see it as a generic Hollywood biopic when you paint it as an optimistic tale of triumph, even though that isn't what happens. And the film is very much a Scorsese film in terms of sensibilities, but it eschews more of his modern-day sensibilities (especially when it comes editing). Nobody else would have painted such a lovingly detailed portrait of the Hollywood Golden Age as Scorsese did in that film, so I think you're crazy when you say that it's obvious Scorsese was a hired gun on the film. He brought a lot of himself to The Aviator.
The movie takes the Spruce Goose fiasco and tries to spin it as some grand triumph, Hughes overcoming those personal demons for a short time before the final descent into madness that is shown at the end. It's a movie about a man's personal obsessions driving away all who are close to him, and eventually driving him into a crazed exile, but the climax of the film is about him trying to put those things aside for a time and prove to the world that he had succeeded, in some limited sense - even though, in reality, the Spruce Goose was a pretty massive flop, even if he did get it to fly for a short time. That it tries to leaven this triteness with a tease of the true madness that would plague him in his final years doesn't really offer any kind of novel twist, as it's a cheap trick.
The movie is bloated, boringly-shot, covers WAY too much of his life to portray any of it with much efficacy (without even trying to convincingly age Dicaprio, who looks prepubescent throughout the whole film, or anyone else, for that matter), and features acting and characterizations that are totally skin-deep and shallow - lots of miming and cartoony voices, but NO sense that the actors have truly inhabited the characters' inner lives, as well. It may superficially have some of Scorsese's stylistic tics, but it's got none of the insight, philosophy, or psychological incisiveness that made him such a great director.
After Hours is a cogent evocation of the weird kind of reality that defines the modern workplace, as well as those that populate it.
The Aviator is a movie that has little to offer and will almost certainly be looked at in the future as an unsuccessful (or, at best, only slightly successful) attempt by a great director to make a more commercial, conventional flick.
Edit: That the movie is not very good is unsurprising to me, given that it's written by the guy who wrote Gladiator - another bloated Hollywood mediocrity filled with cartoony characterizations and, seemingly, zero real perspective on or insight into history.
I suspect "The Wolf of Wall Street" may be at least a bit better, even with Dicaprio, as it at least seems like something Scorsese truly wanted to make, rather than being something he just got brought in on to help a friend.