I would have to say that if the anime is as long as, let's say Bleach or Inuyasha (not pointing fingers or anything), I wouldn't stay committed to it because I like to have answers questioned and questions answered. But, a series like FLCL is too short, because an entire series of that would be simply amazing. So a length like Soul Eater or Rurouni Kenshin would probably be my cup of tea.