Here's a list of videogame series that are decently popular that I like:
  1. The Legend Of Zelda
  2. Final Fantasy (obvoiusly)
  3. Metroid
  4. Metal Gear Solid
  5. Pokémon
  6. Breath Of Fire
  7. Castlevania
  8. Super Mario Bros.
  9. Donkey Kong Country
  10. Mario Kart
  11. Super Smash Bros.
  12. Grand Theft Auto
  13. Kingdom Hearts (I know it's not much of a series yet, but it's gettin' there)
  14. Street Fighter
  15. Mortal Kombat
  16. Kirby
  17. Soul Riever
  18. Tony Hawk's Pro Skater
  19. possibly more that I can't remember

Now a list of not-so-popular series that I like:
  1. The Legend Of Legaia

Neither list was in any particular order, other than memory recall.