You think Coors is bad? Have you ever tried American Beer?
Coors
is American beer. (Unless you're referring to some kind of "American-brand Beer" that I haven't heard of.)
American beer isn't universally crappy, you know. It's not like there's some magic radiation in Ireland or Germany that makes the beer better. The Big Beers are largely watered down in order to appeal to as many tastes as possible, but your local breweries often have all the character that the bigger beers lack. There's a brewery near my college called Augustus Schell - great beer.