Based on play and replay, it seems to be either Payday 2 or Borderlands 2.
Payday2, especially if you have tons of builds and DLC, is a fantastic brain-off mob shooter where you can slightly improve/perfect your build and gameplay with each run. For some reason it just works for me.
Borderlands 2: fun guns; solid story; visuals and mechanics that mostly hold up today. It’s just a good time and another skill-tree builder game where you get to feel like a god if you’ve assembled your skill tree right. The NG+ modes are a bit of a slog, but playthrough 1 is just a solid time.
Makes enough sense, as goofy as it sounds.
Gonna have to do it forever until businesses figure out that half of what makes a game good is that it needs to be a literal passion/art project, and not just a checklist of shit that needs to get done.