Good point, iD were game-changers as significant, if not more so, than Rockstar. Doom has a really significant place in my memories: I'll never forget taking it in to work, installing it on two networked machines, running the .exe file for the multi-player version, and seeing my machine connect to my colleague's over the way! First experience of deathmatch shooters, and it was awesome. All that around 20 Years ago, too....
iD changed the gaming world, Rockstar threatened the actual world, a big difference. I loved growing up with Doom and how Carmack and Romero were like the first rock stars of gaming, driving around in Ferraris and turning nerdy games conventions from monochrome 1-day shows to full colour weekend events.
This movie however is about how one of the most controversial games ever released also becaming the biggest selling, and that ruffled feathers all over the place and woke up the "Rap music promotes rape!" brigade of sheltered, Christian idiots.
Before long Rockstar was forced in to the position of defending video games, all video games. That was the changer.
Properly read, the Bible is the most potent force for atheism ever conceived. -Isaac Asimov