According to Marvel no they aren't different beasts. All these movies are supposed to mesh and work with each other. Iron Man was the start of this.
Yes, and according to Marvel Comics Daredevil exists in the same shared universe as the X-Men or The Watcher, and in a big crossover event that is more epic and all-encompassing in scale, they might even share some panel-space. However, within the
Daredevil comic itself, I think it would be rare to see him teaming up with the Silver Surfer these days, or battling MODOK. Writers like Bendis, Brubaker and now Diggle have established a very grounded tone, a noir aesthetic that pits Daredevil against gangsters, ninjas and his own personal demons rather than galactic despots or supernatural monsters, even if such characters do exist in the same universe. Why? Because shoehorning those characters into the story - just because they technically COULD, given its a shared universe - would just be totally incongruous and contrived within the established tone of the story.
Even in the case of the
Iron Man comic, from "Extremis" onward we've seen the book have more of a focus on espionage or counter-terrorism than full-scale superheroics. Iron Man has been more likely to battle industrial saboteurs or rogue government officials than mystical alien dragons. And when old-school supervillains like Ghost or soon Whiplash have showed up, it's only been after some reinvention to make them fit better within the established aesthetic of the current
Iron Man comic saga.
Take a look at how they reintroduced the Mandarin, specifically, in "Haunted". Gone are the flowing green robes, replaced with a smart black suit. He's less interested in summoning ancient demons to conquer the world than he is with genetic experimentation and attempting mass genocide with biological agents. The magical rings and his convoluted backstory were heavily downplayed, if not outright ignored. And the portrayal was near universally praised, with the Knaufs managing to make a character many fans feared was an outdated relic into a compelling, relevant nemesis once more.
But what you seem to be saying is that the films should make no such attempts to update the Mandarin, that they shouldn't even try to make the character fit more with the established aesthetic of the franchise, and should instead just throw him in there undistilled in all his hokey, stereotypical Silver Age glory - Fing Fang Foom, lizard hands and all - just to... what, to prove a point? When Silver Age Mandarin has been deemed too "comic booky" for even today's comics, you think that he needs to be used in that incarnation in the movies?
Just because I technically could strip off all my clothes and start doing naked cartwheels down the street, doesn't mean it would be a smart idea. And just because Iron Man exists in the same movieverse as Thor and The Hulk doesn't mean Favreau should randomly wrap up the
Iron Man trilogy by shoehorning in magic and aliens, and having Robert Downey Jr trading quips with a talking CGI dragon. I'm all for including the Mandarin in the series, but include him in a way that feels organic and consistent with what has come before. It's not a "realism" issue. It's a common sense issue.