Often, many have wondered, or I assume at least they have wondered, "Why do people enjoy Diablo 3? This game is pure crap!"
Well, I enjoy it for a variety of fairly simple reasons, though for your sake, not enough to write a novel. So here goes.
1. Loot -- Whaaat? I like the loot system. In Diablo 2, you knew what the best piece of gear you would get was, because the best piece of gear was The Occulus, or Harly, or Stormshield, that was it. So you spent the entire 500 hours of farming, hoping to see that one item drop. Addicting, but also somewhat maddening, and a bit silly, because in a game that triumphs on randomization of everything, it would make more sense that you could end up wearing just about any combination of gear. (Yes, more powerful legendaries would be more welcome -- mostly in the area of weaponry -- but it's not really a game killer for me as it is for others.) And what makes me most excited when farming, is that somewhere out there is a drop 100x more powerful than anything I could imagine. This is appealing to me. Some people like to know what they're after, but the great unknown has more appeal to one such as myself.
2. Combat -- The combat can piss you off sometimes sure, but so can Contra and Mario Brothers and Monopoly and just about every other game ever made that was worth playing. Sure, some combinations are just plain unfair, but some combinations are just barely beatable, and for me this is where the game is firing on all cylinders. Where you have JUST good enough gear, JUST good enough build, and are truly on top of your game to just barely eek out a victory against a truly vicious pack. It really adds another element of enjoyment to the game beyond: "Did anything good drop?" For example, just the other day, I managed to survive against 2 elites at once. It felt...wait for it... AWESOME.
3. Disintegrate: Convergence Rune -- Not much more to be said about this one. I mean, pretty freaking obvious.
4. Gold -- It's hard to come by and it has worth. I like that. I like the repair bills since they mean I play that much harder and try to live that much more. Plus, I like money. It's a small thing, but money management really adds another layer to the game play outside of finding loot.
I guess my opinion is a bit skewed since I've ONLY played about 240 hours since release when others have played much MUCH more (and I'm jealous of them for that :P) so I've not quite obliterated Inferno like so many others. I'm slowly working my way through Act 1 Inferno and enjoying finding all of my gear, crafting gems, crafting items, and slowly gaining marginal increases in power, as I grow into a literal god but that's okay, because the journey is fun and satisfying and though this might sound like crazy talk, I hope to continue on it for many years to come.
So that's me. And why, in my eyes, this game is just fine.