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For some definitions of "high quality". It doesn't contain any random crap, but that doesn't mean it necessarily tastes good. Which of course is quite subjective, but IMHO really the thing that matters, and as others have mentioned a big problem with "non-branded" beer: I don't want to buy "a beer", but either try something new or buy something that I know I'll like. Unless they make it a feature (buy a bottle and get something random, with just a small marking to later figure out what it was) this won't work generally.

Even within the confines of water, grain, yeast and hops there's a ton of variation possible in the resulting beer.