Fallout New Vegas director Josh Sawyer has suggested that Diablo 2 actually helped drive sales for his first D&D RPG, Icewind Dale, by launching on the same day.
According to Wikipedia, Diablo 2 launched on June 28 while Icewind Dale launched a day later on June 29, but the sentiment still stands that the two games launched very, very closely to one another. And in an interview with Edge Magazine, Sawyer acknowledged the perception that an RPG like Icewind Dale from a relatively small studio (at the time) launching at the same time as a juggernaut sequel like Diablo 2 would not be good for the former's sales.
