Oarsman is a Berliner Weisse with only modest souring. I'd say that Bell's formulated the beer in a more 'training wheels' manner so that the typical drinker that is not familiar with the style will be willing to drink the beer. A normal Berliner Weisse is powerfully, yet pleasantly sour.
In Germany, flavored syrups are added to moderate the sour and make it more palatable for the typical drinker. That isn't really possible for the typical 6-pack serving.
This is a high wheat content grist with very little hop bittering. The beer is fermented with both yeast and lactobacillus. The acidity of the beer provides the balance instead of hop bittering. This is more the style of a wine with sweet/sour instead of beer's typical bitter/sweet.