1.)Mario
2.)Street Fighters
3.)Smash Brothers
4.)Megaman
5.)Ninja Gaiden

1. Ratchet and Clank
2. Pokemon
3. Mario (Counts as any Mario game: Kart, Smash Brothers etc.)
4. Jak and Daxter
5. Quake

1.Super Smash Brothers
2. Legend of Zelda
3. Mario
4. Mario kart
5. Grand Theft Auto or Halo tie in my book ....

My Top 5 Game Series
1) Suikoden
2) Wild Arms
3) Super Smash Brothers
4) Grandia
5) Star Ocean

1 Mario
2 Final fantasy
3 Pokemon
4 Dragon Quest
5 World of Warcraft

1.- Half-Life
2.- Zelda
3.- Mario
4.- Sims
5.- Silent Hill

Awesome list, I know.

1. Halo
2. Half-Life
3. Gears of War
4. Call of Duty
5. Virtua Fighter series

World of Warcraft is not a franchise, WarCraft on the other hand, is (WC1, 2, 3, WoW) :)

If it was my favorite franchises of all time, it would be:

1. Ultima

2. The Elder Scrolls (Morrowind and Oblivion)

3. MGS

4. FF

5. Madden

I realize those are no where near the most successful, but I have bought, and enjoyed almost every game from those franchises.

6, would be WarCraft :p

Fallout
GTA
Elder Scrolls
Wing Commander
Total War