Board Thread:Questions and Answers/@comment-7823447-20140421150120/@comment-4651179-20161216042616

Please watch your language.

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And don't forget the fact that sonic attacks have managed to heavily weaken Captain America (as seen in Civil War), Iron Man's armor has managed to predict his moves (both in comics and the movie, a major point in the latter as that's how Stark turned the tables in the final battle until Cap had assistance from Bucky), and is also capable of targeting and hitting much more agile and faster opponents such as Nightcrawler (a teleporter, no less) or Dark Elves. Captain America's shield doesn't guarantee he could shield himself from every attack, considering that thing can't cover his entire body all at once. And there's no guarantee either he can't be disarmed.