Perhaps I misunderstood finely. No, I don't care for Sam Adams, either. But, if he was referring to American beer in general as "American crap", then he's way wrong.
There are many, many fine quality microbrews in the US, and the selection of styles is enormous.
Then you really haven't tried much. The selection of styles in the US is enormous. I cannot think of a style I haven't seen brewed and available in the US.
Oh, Lord. You don't know what you're talking about. Sorry. If all you've tried are German lagers, then you haven't even scraped the top, yet. And what type of lagers have you tried? Its not like German beer refers to only one style of lager. And the Germans do brew a few ales, too.
And your guess is wrong. The US ancestral beer roots are in ales. When the US was founded, ale (rather than lager) was declared the official beverage of America. German immigrants did bring their brewing styles later.
Honestly, if you think US beer is most characterized by characterless German lagers, then you really do not know much about recent and current American brew culture... because ales are king in micro-brewing America.
I like many styles of Belgian ales. But, we in the US do not need the Belgians to show us how to brew. There are already many microbreweries brewing Belgian-style ales in the US. Many of these are of very high quality, too.