I have several thoughts on this...
Sam Adam Lager and Summer Ale were some of my favorite beers while in the US. Their original brewery in Jamaica Plain, Boston is a fun tour to do IMO. Plus, when you´re finished you can head over to Doyle´s Cafe for what I think is a great U.S. Irish pub experience.
I know that Sam Adams were mulling over having a brewery here in Germany contract brew for them. They sent a delegation to the brewery I worked at, but nothing seems to have come out of it...From what I can gather, Sam Adams lager is comparable to a German Märzen or
Oktoberfest beer, although more hoppy (they add hops directly into the young beer, so you get a powerful hoppy essential oil aroma.) If you like Sam Adams, try a German Märzen/Fest/Jubiläums type bier (keep in mind they will taste more malty sweet).
As far as the beer, this proves that American Brews can stand on their own against even the Germans. We have great Beer traditions/Culture in the U.S. Unfortunately, most people here think U.S. beer is of BudMillerCoors type. I was at the house of 111 beers in
Schwabing last night and am sorry to say very dissapointed with their selection of beer. For US beers they had Bud, Miller, etc. There was no Sam Adams or Sierra Nevada or comparable micro brew. They listed one called "The Raven" which I´ve never heard of - any TTérs know it? Anyway, their selection does not do justice to the American beer scene IMO.
Someone above mentioned Alt bier and Diebels. Alt Bier is a GREAT and unique German beer! If anyone wants to broaden their German Beer Horizon beyond the Münchner Helles, I would very highly recommend a trip to Düsseldorf. You have to go! Diebels is ok, but it´s a mass market alt. For better beer, go to the Düsseldorf Altstadt. They have several microbreweries that are known for their Alt brews - Uerige, Zum Schlüssel, Füchschen, and more. And not only tourists go there, in fact when I was there, it was an evenmixed crowd (young,old,german,non-german). It´s perfect for a weekend trip, and you can always cross the border to Holland as well. Alt bier is IMO similar to some British Ales. Just imagine, sitting in Zum Uerige,a FRESH Alt in hand, with a Mettwurst brötchen (a traditional accompaniment to an Alt), and chatting with your neighbors...Prost.