They started outsourcing their brewing a few years ago.
I have never been the biggest Sam Adams fan, the Boston Lager was ok, I did used to really like their Summer Ale and their black lager is still my favorite beer by them. But it does explain somethings. I do know other posters here (I think AZ and Psychopuck) also noticed how crappy the Summer beer especially has been the last few years.
**** you Sam Adams for going the cheap route!