The taste is just oh so much better
Not always true - in fact, a lot of the larger breweries got to where they are by making at least one stellar beer. (not always true as Coors and Anheuser-Busch got to where they are by making a popular beer with lucky marketing breaks and a hefty profit margin)
With that being said, the quality control at larger plants is generally much stricter than a microbrewery is capable of.
That's not to say that microbreweries are without merits - My cousin is capable of producing nearly the legal limit of beer as homebrew without being classified as a microbrew and he has made 2 of best I've ever had, not to mention the various Microbrews I've been blown away by, but with that being said, there are treasures all over with the big breweries too. Guinness (Guinness), Fat Tire (discontinued, formerly Anheuser-Busch), Michelob Amber Bock (Anheuser-Busch), BlueMoon (Coors), Yunling (Yuengling brewrey - mid-size) Much of Leinenkugel's offerings (Leinenkugel brewing co. - mid-size), Almost anything Dogfishhead makes (Dogfishhead - mid-size) and a good chunk of what Sam Adams makes (Sam Adams Brewrey, mid-large size)