mine are
the mentalist
numbers
john doe
journeyman
forever
Quantum leap
early edition
the invisible man
moon light
Lois & Clark: The New Adventures of Superman
Hercules: The Legendary Journeys

for comedies
the honeymooners
i love lucy
sanford & son
Mr. Belvedere
California Dreams
the wonder years
perfect strangers
bosom buddies
mama's family
family ties

Nanny and the Professor
Dark Shadows
The Pruitts Of Southampton

Yancy Derringer - should've gotten a good, full run of three or four seasons, instead of just one

87th Precinct - ditto

Thriller (Boris Karloff) - deserved a third or fourth season of mostly horror-story episodes

Stoney Burke - deserved a second season

The Outer Limits (the 1963-65 original) - deserved a third black & white season

Jonny Quest (the 1964-65 original) - needed a second season

Coronet Blue - deserved a couple of seasons, or at least a full season, with the mystery of the main character's identity resolved in the final episode

T.H.E. Cat - three seasons, rather than just one

The Invaders - three seasons, instead of one and a half, with a series finale, like its sister show, The Fugitive, received

The Addams Family - a third season, though it would be weird seeing it in color, which it would be, in a theoretical 1966-67 season.

Kolchak: The Night Stalker - a second season

WKRP in Cincinnati - had a solid four-year run, but could've had another strong season or two

Deadwood - needed a fourth season to wrap things up properly

Dead Like Me - needed a third season, at least, retaining Mandy Patinkin and Laura Harris, which the 2009 follow-up TV-movie didn't

Pushing Daisies - four seasons rather than two

Terriers - deserved a full run of four or five seasons, like most premium cable dramas do these days

Gidget

Julia

Lincoln Heights

I Dream of Jeannie

Uncle Buck

Everybody Hates Chris

Generations

All My Children

Get Christie Love

Room 222

Gilligan's Island
F Troop
The Monkees
The Outer Limits
Star Trek (original)
Batman (original)

Jackie only wanted the Honeymooners to last only one season, I don't know why.

M Squad: Lee Marvin was incredible here as Lt. Frank Ballinger of the titular division of the Chicago Police (at least IMO), so I thought that this NBC police series should have lasted longer than 1957-60

Gidget

The Torkelsons
The Ropers
Three's a Crowd
Hazel (for 1 more season)
Mama's Family (for 1 more season)

Three's A Crowd
The Critic
Teen Angel
Knight Rider
Herman's Head
The Single Guy