Superman flight doesn't have the 'can we do that too?' moment because other than it's been done before in the 70's movie, Superman is a super powered alien. Almost everybody know Supes main feat is flight. Tony Stark is human, his achievement owed by his tech ingenuity and connects with the audiences more. If Stark could fly inside an exosuit, ordinary people someday could do too.
That is an interesting argument. that you prefer IM because you could
one day do that too.
I believe you are fully entitled to your opinion. But your reason for holding that opinion seems to raise some logical issues.
1) Are you familiar with the superhero paradigm ? Often the "super" refers to the fact that they possess abilities that normal humans do not, and could never have. In saying it's been done before, well, Superman was the first super-hero, he's been around for 75 years so actually, he did it first.
2) If you can only enjoy a character's exploits because of the "we can too" factor, then you must not really enjoy the triumphs of Thor, Spider-man, or the Hulk. Surprisingly people often do enjoy seeing Wolverine win fights, despite the fact he's functionally unkillable.
In the same way, many enjoy Superman immensely, although he defies most of the laws of physics or biology. We can never be like him, but we can still enjoy his stories.
(e.g. his first flight being an important moment in the character's development where he first comes to terms with his alien heritage, and accepts his true identity)
So, in summary, saying you prefer IM to MOS because you just enjoyed it more is cool. But, if it's because of the "we can too" factor (are you a billionaire, genius, playboy, with a completely impossible fusion reactor in your chest ? ok, then let's put that aside) anyway, you are limiting yourself to a very small portion of the superhero genre.
Personally, I hated Harry Potter, but several billion people disagreed with me, despite the fact that none of them had functional wands, invisibility cloaks or could speak to snakes.
In closing, I would argue that the precise reason people like those stories, is because they don't have those amazing, but imaginary things.
A lot of us like superheroes, not because we'd like them to be like us, but because we'd like to be like them.