I suppose pre-prohibition Annhäuser-Busch beer might've been quite good
Problem is, it is not that Americans do not know how to brew, but rather that they have been used to that kind of horse piss for far too long. I always wonder how easily the few remaining GIs in Frankfurt get drunk, even if they're quite well build and look as if they could take a few.
That said, Frankfurt is a cider (and to a lesser extent, wine) area and the local beer is so bad it could just as well be american, only it is stronger.
This belgian company is not a brewery, but rather a brand holding company specializing in beers. They usually leave their brands unchanged. They do own some quite famous german brands like Beck's or Franziskaner.
Problem is, InBev keeps large national brands while killing off small, regional competition.
So I suppose the Quality of Bud won't change for the better or worse.