As a vetted german beer enthusiast, may I say that the big-brand beers are on average as good (or bad) as the american beers I know. Differences imho originate from drinking preferences (light beers) and allowed ingredients or additives, but that has a minor impact on sensory quality. Personally I often missed aroma and bitterness (hops) and gravity of most beers I tried in the USA, but that‘s just me.

I tried amazon basics for the frist time and I must say, the quality for price ratio is amazing (sorry). Not sure abt sustainability though …