The Honeymooners. Nevermind the idiotic marketing ploys to make you think this is good so somebody can sell video tapes of the series--it simply *was* excellent, and was recognized for its quality at the time. The three principals were first rate, with the plots simple enough to give them plenty of opportunities to demonstrate their skills. It was all done live, too; and it did encompass a level of life in NYC, at the time, with rather greater reality than anything else that would show up for at least 30 years.
Burns and Allen. Deft and zany wit, with bizarre touches of fantasy--like George's television, which let him tune in to whatever his wife and friends were plotting; or the monologues that he (and Gracie) would occasionally deliver to the audience, fully in character.
The Many Loves of Dobie Gillis. I'm still astonished this show ever succeeded on American television at the time, given its cynical, unfaltering humor, aimed at so many sacred institutions. Wonderfully bizarre cast of characters, impecable acting (even from Bob Denver), marvelous timing.