Linux user since 1998, checking in.

Uplink, Neverwinter Nights, and a few other games had native clients circa 2002-3. Wolfenstein and CS worked via opengl and wine. World of Warcraft, doom 1 & 2, StarCraft 1 (I never played 2)

Sometimes it was a pain getting games to work, for sure. And it's 1000% better than it used to be! But there were lots of games available even back then, if you knew where to look.