First off, Potosi does have a pretty good back story. Check out their website http://www.potosibrewery.com. There is a lot of history with the old brewery and how the new owners are using that to establish their new brand.
I recently tried a few of their brew...I must say, I was not all that impressed. Like others have said, if they are targeting the Miller and Bud drinkers (which some craft brewers are going for these days i.e. Liftbridge) then they have a pretty presentable product. If they are going for the hard core craft beer drinkers I would say they are off the mark.
I had a conversation with Liftbridge Brewings owner Steve Rinker not too long ago and he described their business plan as targeting those BMC drinkers that want to get into craft beers. They are trying to sell to a much larger demographic but still keep the craft brew label. Now that they have established themselves in making some fine sessionable beers they are branching out to more complex different brews.
Not a bad plan, just a different business approach to the craft beer market. I think