The Dungeon of the Day
was a little experiment that I did a year ago along these lines. It wasn't popular enough to merit continuing at the time, but perhaps post-release it could get more momentum.
These were our scoring rules at the time:
The current medal scoring rules are as follows:
Warmonger = 5 points
Faithless, Hoarder, Purist = 4 points each
Unstoppable, Parched and Miser = 3 points each
Ding! Max = 2 points
Specialist and Cheeky = 1 point each
Furthermore, some classes are worth addition points:
+0 classes: Rogue, Berserker, Assassin
+1 classes: Warlord, Monk
+2 classes: Bloodmage, Paladin
+3 classes: Sorcerer, Fighter, Vampire, Gorgon, Tinker, Transmuter
+4 classes: Priest, Half-Dragon, Crusader, Thief
+5 classes: Wizard
Ties are resolved by completion time.
The specialist badge has been made substantially easier since that time, so I probably wouldn't even count it towards scoring anymore. In terms of class balance, the Assassin and Bloodmage have been nerfed, while the Wizard has been buffed, so I'd adjust them accordingly.
These scoring rules, while they were an effective approach, did create a strong meta-game advantage for the Halfling/Gnome/Goblin races. With these races, you could attempt
the hoarder badge without having to fully commit, giving them a strong scoring advantage.