I generally don't like franchises... Spinoffs are almost always crap. Movies and stuff is worse. There are some game series where I like most of the core games a lot, like Pokemon and Zelda from the poll. I can't vote for Pokemon, though, because there is too much crap associated with it. I also can't vote for Zelda because the only 3D Zelda I played was Twilight Princess and that was only a good game, not amazing. Minish Cap also wasn't my cup of tea.
I would probably have voted for GTA because I loved Vice City and San Andreas a lot and am very exited about GTA 4. I never got the hang of GTA 1 & 2, though, and I didn't play GTA 3 very far, either.