Top 10s are always iffy, but:
-Planescape: Torment
-Baldur's Gate 2
-Morrowind
-Fallout 2
-The Longest Journey, Dreamfall, etc.
-ADOM
-Master of Magic
-GTA: San Andreas
-Europa Universalis 2 or 3
-Witcher 3
Shoutouts of course to Grim Fandango, KoToR, Alpha Centauri, Deus Ex, Pokemon Gold/Silver, Bastion, Rome: Total War, etc.