I enjoyed the 70's classic All In The Family. That show was terrific and nothing was off-limits, they covered everything from politics to religion, racial issues, etc. When I was younger I enjoyed Boy Meets World...that show was good since the actors started out young, and the show ran long enough you got to watch them grow and mature as well.
Most of the shows I currently like are still on the air so those are just a couple of my older favorites.