I think once you hit diamond or so, Doomfist starts to become much scarier. At that level, you have people playing him much more consistently, and I have definitely been in plenty of games where it felt like a single Doomfist was rolling my entire team.
His kit has so much potential. Incredible mobility, incredible burst damage, potential one-hit-K.O.'s with rocket punch, and his ult which is his weakest tool but still useful as a OH-$#!^ button.
I don’t think Doomfist is broken, but I do think he’s incredibly strong.