1. Alfred Hitchcock Presents
2. I Love Lucy/The Lucy-Desi Comedy Hour
3. Bachelor Father
4. The Jack Benny Program
5. Ozzie and Harriet
6. Leave it to Beaver

I haven't seen as many shows from the 50s, so I can't make a complete top 10 on this one.

1. I Love Lucy
2. Father Knows Best
3. The Honeymooners
4. Leave it to Beaver
. . .
These are the four standouts for me.

I could also put:

5. George Burns & Gracie Allen
6. Jack Benny Program

but I haven't seen a lot of their episodes.

1. Leave It to Beaver
2. Alfred Hitchcock Presents
3. Maverick
4. Gunsmoke
5. Yancy Derringer
6. M Squad
7. The Honeymooners
8. Dragnet
9. Panic!
10. Ernie Kovacs

1. Leave It to Beaver
2. Alfred Hitchcock Presents
3. Maverick
4. Gunsmoke
5. Yancy Derringer
6. M Squad
7. The Honeymooners
8. Dragnet
9. Panic!
10. Ernie Kovacs

You might find this hard to believe, but I only have two favorites of the 50s-- M Squad, which you mentioned above as #6 on your list, and Perry Mason.

thees show only ones i seen:
#1 i love lucy
#2 the honeymooners
#3 The Abbott and Costello Show
#4 Bachelor Father
#5The George Burns and Gracie Allen Show
#6 The Phil Silvers Show/Sergeant Bilko

In no particular order:

Leave It To Beaver
The Honeymooners
George Burns And Gracie Allen Show
The Phil Silvers Show
The Jack Benny Program
Make Room For Daddy
I Love Lucy
Dennis The Menace
Father Knows Best