Originally Posted by kedrell
I disagree. When it comes to action roles, Tom Cruise seems to just play the same character in every role. So it'd probably be the same here as well. Only when he's playing a bad guy like in Collateral or IWTV or comedy like Tropic Thunder does he seem to go beyond that.
What makes you think he couldn't pull off a Collateral level of performance as Tony Stark? I'd argue Cruise has more versatility than RDJ.