Fuck Diablo, play Grim Dawn.

Grim Dawn lets your character have two simultaneous classes, creating lots of unique skill synergies to let you make lots of interesting builds. On top of that there's a ton of weapon types, lots of skill mods, constellations for overall buffs, and several more layers of customization besides. The world and story are interesting, the music and mood are great, and you won't be giving money to one of the scummiest video game companies out there.