Path of exile is a love letter to diablo 2. It also has materia from ff7 and the sphere grid from ff10 turned up to 11.
It is also deep as fuck, and thus easy to get lost in. There’s tons of side projects in the game (mining, heists, hunting, just to name three I remember). The skill grid is huge. The in game economy is complicated.The core game is huge and then there’s a huge end game about exploring maps that has its own skill grid. It’s like a decade of content.
You can play it casually. Just go and click on monsters , pick good sounding stuff on level up, and have fun.
You can also look up a guide for your build. You’ll probably do better, but then you’re following a guide.
If you want a game that has a lot of depth, it’s fantastic. If you want something shallow but fun, it can still work but it’s possible you’ll hit parts where your character is built poorly and struggles.