That's great to hear. I'd been making due with Sam Adams Black Lager, which I found to be very similar.
Sam Adams makes some fine beers to be sure. But keep this in mind, for what it's worth: Just like it has for the past 98 years, every drop of Shiner beer is brewed by only 55 dedicated, beer-loving people at the Spoetzl Brewery in Shiner, TX, population 2,070.
Sam Adams, on the other hand, is largely contract brewed by several different breweries. And the "Boston" Beer Company (founded in 1985, although founder Jim Koch has deep brewing roots) is actually based in Cincinnati, Ohio.
Now I'm admittedly biased, and while I strongly urge everyone to drink Shiner (two a day, please), if you'd rather not, then at least drink beer from one of America's many great small craft breweries.