The buck stops with the management @ 3DRealms. After 10+ years there is almost nothing to show for their product. It is not the developers fault... especially if what I have read about them having to contrantly scrap and rework the same maps over and over again because someone in management kept stopping progress.
If there is a problem you fix it. I can't belive this game could not have come out in 10+ years. 10+ YEARS. The people who are payed to make the decisions apparently didn't and the company bled dry. Nobody knows how complete the game is. 10%? 50%? 90%? It's all speculation because little has been shown.
And I doubt we will see anything now because if the game was still not near completion it would make the people in charge a laughing stock.