As I said, it is not a big enough difference to bother ME. Obviously, that is in the eye of the beholder (well, I thought that was obvious). This is not a matter of debate - I am not trying to tell you that YOU should be ok with the difference, just please grant the same courtesy to those who disagree with your weighting of the difference.
In terms of figures not matching the prototypes, take a look at just recent figures, all of which had big complaints about difference with the prototype::
-Wolverine from the latest movie of that name ,
-Golden Age Cap (yeesh, that expression),
-CA:TWS Black Widow
Golden Age Cap was bad enough that I skipped it.
One other point - I agree that the proportions are significantly different than the prototype for Stealth Cap, but I don't have a preference for the prototype's proportions (that V shape that some really want just doesn't matter to me). What does bug me is the reduced articulation - but not enough that I would mod the figure.
To each their own - I know some LIKE the GA Cap, for example - I am happy for them and would not try to convince them that they SHOULD dislike him. (Different discussion if you want to criticize Sideshow for not more closely matching the prototype - little to argue about there.)