There is not a single player in any top 10 1v1 ladder than has not proven himself through a variety of metas. If anything I'd say they are less likely than the general player base to abuse whatever is OP at the time.
Centaur used almost all the time by top players, decrew is used as well by top players ( not all of them)
KV-8 is clearly broken (but not to the extend of Croc)at the moment is used by almost everyone of the top players
ISG every OKW player is building it regardless of rank. And everybody knows the unit is broken
Rifle Company same thing didn`t see a single USF player not using it by default in every game ( Although that is mostly because all the other USF commanders are kinda useless)
Then again it`s my opinion that using all of these is abusing a Broken/OP unit, you may not think the same and its okay, everyone has his opinion