To me, Diablo 2 set the loot bar and it still hasn't been toppled. although other games have beat aspects of gameplay/content, as a package it still reigns supreme.
Loot is awesome when done in the Diablo archetype. Collecting items in an arpg like this is fun because it makes you look cool, has statistical, visual and gameplay enhancing properties, has a rarity parallel to how much it enhances those things, and has interplay between other items and passive/active abilities, are obtained by beating harder and harder enemies that can only be defeated by progressing your created character, and so on. So some may call it a trick, but to me it requires a mastery found in few other games. It's almost like doing chemistry in a videogame, and the point is to achieve more powerful character "formulas" that build up through time (grinding), skill (active gameplay), and strategy (stat allocation and interplay).
But not all games are well rounded in these areas. Destiny is way more active and advanced in the skilled gameplay department but much weaker with the loot/progression system. If you don't have that, that loot dopamine drip isn't dripping right. I don't really know where I'm going with this at this point but...yeah, loot can be tight.