Okay the Diablo comparisons and the idea of loot grinding with a ton of subsystems has sold me.
Is this like Diablo/Borderlands in the way that you can basically do most of the progression on your own? Or is it more MMO-like where you have many people in the game world?
The game is more like Destiny than an MMO, in that you're generally fighting in instanced areas either alone or with a small group. There are community areas with large numbers of people in them at once, but they're the exception rather than the rules.