If you haven’t played a game like this, there is a learning curve. I’ve been playing stuff like this for decades and there’s still lots to explore, in purely mechanical terms, with BG3.
That said, it is very much worth the initial investment. I found playing Divinity 2: original sin very much prepared me for BG3. You could start there a little more cheaply before delving into this expensive title. At least then you can see if you enjoy this style of game.
I took a long break from gaming (~15 years). Then when I came back too it I found all these great games that had came and went. So I started parsing through many of the most critically acclaimed games. I hit Arkane, and Dishonored was so incredible (and I got Prey with them in a flash steam sale for a few bucks), I thought I’d give it a try.
I will say it’s probably one of the best games I’ve played in my most recent gaming phase. It is a super solid sci-fi horror where you can engage. I do not like run and hide games, so this one fulfilled my criteria. The story is also classic sci-fi greatness.
It’s also one of the few games I’ve got an itch to play again.