Re: The True Tony Stark
RDJ's Tony is a countering personality for 2 guys in the MU often associated with him:
a) Steve Rogers - a very serious, reserved man.
Additionally: Thor is a very serious demigod.
b) Reed Richards - a very serious, reserved man.
Additionally: Serious-introvert Bruce Banner, T'Challa and perhaps Henry Pym (but I doubt it)
So yeah old book Tony Stark was boring and brought no countering personalities against some of the MU established characters.