Some Ritual Spells asks for a specific monster (the most relevant one in DL, Machine Angel Absolute Ritual, restricts you to Warrior or Fairy), or asks for monsters on the field only, there's even a Ritual Spell that doesn't use tributes at all (one of Gishki's Ritual Spell uses your LP instead).
This thing was overused pre-nerf switcheroo in relinquished / venus decks. A +1 and a deckthinner.. what more did you want? Not to mention the 2 dragon fusion recipe to endlessly grind SDs.
Yeah, a real crappy card..