I don't know many mainstream beers, since I drink mostly local microbrews. The only mainstream lagers that I would even suggest would be any by Samuel Smith or Samuel Adams. I can say that if you are drinking from a can you are most likely doing it wrong.

Thought of a few more. Yuengling is a great one, and Michelob Amber bock was my first beer which I still drink fairly regularly to this day. However, I actually prefer Shinerbock when it is available.