I agree that the large breweries make the most consistent beer.......but that doesn't make it a good beer. A good beer is defined not just by the brewing process, but also the ingredients. And, like others have pointed out, Bud uses rice, while some of the others use corn. Both are considered adjuncts and their only purpose is to convert to fermentable sugar that is cheaper than using actual grain. As for your assessment that microbrewies have quality issues and are not consistent, that is simply not based on fact. What is based on fact is that I've toured and been to more than 2,000 breweries throughout the world from Belgium to England to Canada and throughout the United States. Most of those brewpubs / micro-breweries have put out products that are in a completely different league than anything coming from the big-boys. Just to name a few, Sierra Nevada and Anchor Brewing Company. Remind me again how these micros are not consistent. As for other companies that make consistent products that suck.......here's an abbreviated list.
Dominos Pizza and Pappa Johns both make consistent pizza. It's poop, but at least it's consistent.
Wendy's, Burger King, McDonalds all make consistent "hamburgers." They are poop, but at least they are consistent.
Bose makes consistent speakers. They are poop, but at least they are consistent.
So to assess that just because something is consistent, which in this case you are correct, doesn't mean it is a good product. If you really want to try a light pilsner, which is what Bud is based on, then do your pallet a favor and drink a Pilsner Urquell. In that, you will experience high end grains and noble hops and oh by the way, they have been making it consistent for over 170 years.