tl;dr play Grim dawn.
Grim dawn is just better titan quest. TL2 is just bad.
Poe has a lot of problems not present in GD. Poe engine runs like shit, visuals are all over the place, difficulty is pure random with some random mobs being able to kill you because "lol 10 smallest rats crit", its always online, etc etc. Balance is also not the greatest "its funny when players die to oneshots" more on that later. But GD has very boring skills and builds. They are analogue of non linked skills in poe and many skills are exactly the same but with different color. And Poe is gigantic at this point.
Balance in poe is really fucked up. All spells were dealing elemental damage. But everyone had 75% elemental resist, so all these spells were dealing 1/4 of damage despite their big (damage) numbers. Later they added physical spells with same damage numbers but without any reliable way to resist them, so in practice they were dealing 3-4 times more damage. A lot of it meant instant death. Corpse exploding mobs are also fucking fun. No matter how fat you are corpse explosion kills you. And they can cast it from far away, before you can see them. And some mobs were instantly exploding when you kill them. It was smoothed out later but its was that way for years. Also, hard boss in poe is the boss which can oneshot you and easy boss is the one which cant oneshot you.
And at high level poe requires too much work. Lets say you want to do maps, for it you need maps and you dont get enough with casual play. You will waste maps/currency by doing them inefficiently. You will need to make proper atlas, sexstant your maps, manage influence, roll well your maps, sexstanting often requires additional scarabs, you will need master missions, from time to time you will need empty your sulphite, and sell away shit if you play on trade league and buy sexstants/shit for map crafting.
They really could fix that shit by giving players semi-unlimited maps. Whole map rarity existed because "what if players try to do hard maps and fail, we cant let that happen".
Btw Nioh is also good diabloclone, with builds, grinding and monster killing. It starts like dark souls clone, but turns into diablo pretty fast.
Its diabloclone. The biggest one in market right now.