D2 (Not D2R) is also a lot like Torchlight II in some ways but because of its age it’s honestly rougher around the edges. D2’s got nice, streamlined, and somewhat easy to understand skill trees, a mix of overworld/dungeon areas, and really fun loot.
The few problems I have with D2 these days are: the lack of QoL features (no pet to pick up stuff for you and sell it) you have to use town portals to sell your junk. Combat in D2 usually boils down to spamming around 1-2 abilities, which is only fun because when you get powerful enough those abilities are super ultra powerful and make you feel like a god. The worst thing about D2 is that classes and builds really are unbalanced, but thankfully its actually a single player game like torchlight 2 so you can use mods, change the difficulty levels, and even cheat to your heart’s content.
If you like Torchlight II you should give D2 a try if you can stand the dark themes, it’s still a fantastic game that holds up well and plays great for casuals just as much as it does for hardcore players.