At the end of the day... Ironman is more of a flying and long range fighter. At this strength with all his weapons yes he will fukk you up from a far. But this was CQC, he was in range of Cap and Bucky's greatest strength and his greatest disadvantage. Maybe if he he could've flew away and shot his pulse rays maybe he wouldve beat them, but the reality is they would just dodge them.
At his core he is basically just a rich kid with powerful tools, he's not a top skilled fighter. I dont see how its unbelievable that he'd catch a fade from not only one but TWO amazing fighters.
Did anyone notice how they were keeping him contained in a small room and all the attacks were grounding him and coming at a rapid speed? What the fukk can he really do with that?
No, his powers werent "nerfed" he just was biting off more than he could chew and these were the results