Q: Gold, Silver & Bronze Scoring?

@nobodyspecial Those ranks don’t actually have an impact on scoring, they only allow you to get extra cards quicker.
Yes, there are ranks beyond Gold: Azure, Emerald, Amethyst and Diamond.

@nobodyspecial It would depend on what the enhanced bird damages in a level (e.g. materials, pigs, TNT). Golden Pigs automatically give you an extra card once popped, and I don’t think higher levels will give you a bonus in Destruct-o-Meter fill-up after the bonus card.