Top 3 is hard. I'll start with the first three that came to mind, in no particular order:

• Witcher 3

• Star Control 2

• Monkey Island 2

But there are so many that I could have listed instead.

The Commander Keen games are amongst the first I remember playing, I loved those and played through them so many times.

Baldurs Gate 3 was such a masterpiece, it probably could bump W3 off that list.

Although, Ultima 7 was the first RPG I played where I became properly immersed in the story. The world, the characters, the way the mystery of the main story unfolds. And it is actually a really good jump-in point for the series as it's set a couple centuries after number 6.

Fallout 1 also could easily make the list. I loved the way such a small and intimate quest for your vault unfolds into something bigger.