I spent countless hours playing Diablo 2 and its expansion, and it probably only barely edges out Starcraft for hours played. My introduction to role playing games was the first Diablo (On the Playstation!) and NoX (a Westwood game) and Diablo 2 thereafter. Both gave me a lot of good memories, but Westwood died after NoX and Blizzard also had Starcraft. I was passionate about Blizzard from this point. When World of Warcraft came out, I jumped from Star Wars Galaxies to WoW and never looked back. I was smitten once again. WoW felt like it took the ideas of what I wanted from role playing games and made everything bigger and more realized.
However, on reflection and while listening to Kyle Bosman and Jason Schreier talk about Blizzard and WoW, I realize the world of Azeroth was probably what ruined them for me. Despite years of love, and subsequent love-hate, I think the path Blizzard walked for World of Warcraft changed the company from one that made games regularly to one that only focuses on, and before the phrase really existed, live service games. I remember when Starcraft Ghost was canceled and then I just stopped hearing about Blizzard working on new games. I did jump into and play Overwatch thoroughly but even that eventually had its doors closed and got replaced with Overwatch 2, with extra emphasis on forever-money.