> It's amazing how many new standard things came out of Diablo and Diablo II. [...] The rarity thing [for loot], for example, just kind of made sense.
While Diablo certainly helped popularize quite a few such features and even arguably gave birth to a genre (I heard people calling various other games a Diablo), it would be overconfident for them to claim inventing it: Magic the Gathering [1] had it years prior. There, rarity was implemented with printed pages: you print all your common cards on a Common sheet, uncommon cards on an Uncommon sheet and rare on Rare sheet; then put 1 card from Rare, 3 from Uncommon and 9 from Common into each booster pack. (not actual numbers! there are also Mythic Rares and each card has a tiny chance to be a Foil version, which complicates the situation, but the basic idea is something like that; from memory)
Same goes for the idea of a quest log: I don't have a specific example in mind, but I have a hard time believing no game had it before Diablo II.