I'd like to say Zelda, but I didn't like PH. Actually, I didn't like most of the 2D ones. Oh, and Majora's Mask was a dissapointment - a huge one (the game is great, but OoT is my favourite game ever, so it had a lot to follow up to).

I'd like to say Mario, but he stars in several sports games I wouldn't like.

I'd like to say Metroid, but I didn't really like 2

I'd like to say Pikmin, but Pikmin 1 was rather dissapointing in a few areas. It also has too few games.

I could say Smash Bros... Yeah, Smash bros.

Mario Kart too I guess.

Wii series, but I haven't played Music.

Fire Emblem? Well, I wasn't too fond of 5, but that's a bit because it is so dated. I guess it could make the list.

Pokemon? No, I don't like several of the spinoffs, and D/P did dissapoint a bit.

Half-Life

Team Fortress (I played 1 for a bit too, even after I had 2)

Final Fantasy (incl. spin offs)
Pokemon (all handheld games + stadium and snap)
Trauma Center (ds games) - havn't played Wii versions
Grand Theft Auto (PS2 games) - havn't played GTA4

Pokemon (handhelds)
Super Smash Bros
Kingdom Hearts
Zelda if you don't count the Wind waker
Numbered final fantasy

Zelda 2 and the CDI zeldas

Star ocean 3

VP 2

Zelda 2 and CDI zeldas

Jack 3

Fire Emblem 3

Ico

Sunshine

GTA GBA

All these franchises have 2 or more games, and I have yet to be disappointed with any of them.

#1 by a long shot, the world's most perfectly flawless franchise:

Kunio-Kun

Nintendo:

Mario
Zelda
Metroid
Punch-Out!!
Pilotwings
Mario Kart
Smash Bros.
Mario & Luigi
Pikmin
Kirby
Dr. Mario
Excitebike/64/truck/bots

Non-Nintendo:

Tetris
Diablo
Katamari
Half-Life
Metal Slug
Battletoads
DuckTales
Ouendan/E.B.A.
Lode Runner
Smash T.V.
Geometry Wars
Q*Bert
SimCity
Civilization
Viewtiful Joe
Space Invaders

It hurt to discount Double Dragon for The Shadow Falls, but I had to do it. I didn't put Kid Icarus on there because I haven't gotten around to playing the Game Boy sequel, even though I've had it for years. I should get on that.

World of Warcraft

Kingdom Hearts: Chain of Memories

Zelda 2 and CDI Zeldas

Origins

Tales of Legendia

Final Fatasy XI

CoD 3