First off, Yuengling > Boston Beer Co.
Now that I've got my regional preferences out of the way, I think it's great what Sam Adams has down with different styles and making them widely available. On the flip side, they bastardize lots of styles, like their "Cranberry Lambic". There's no brett, or even lacto that touches the beer. That's an offensive to Belgian (and a few American) brewers making real lambic.
Check out my blog! Lambic brewday!