DN became famous because it was one of the first of their kind!
Now, it's nothing more than an average game, as technology as developed (especially with quake), 3D special effects have improved, even the standard adventure games have far more scary looking creatures than the first doom game out there!
So in essence, DN has just upgraded from their DOS version to a WIndows MMX compatible version, that runs on a higher than 800x600 pixels!
I'm not surprised! Even if DN would come out with yet another game right now, it'll just have to surpass Halo, Crysis, and all those games, in SFX and graphic quality, while maintaining the same game play.
And besides, who still is looking for a hero, shooting bad guys?
The bad guys of the '80's where the nazi's.
Back then it was alright to portray them as bad.
The bad guys today are terrorists with tulbands and beards.
Portray them today in a game as bad people, and you have (a) lawsuit(s) pending!
Things are different today as they where back in the days.
Back in the days it was time to get out of the system of blind obedience and rebel against authority. It has helped us to become free-er and more self sustaining and creative.
Today there's just economic hard times, and limitations, and money is nowhere.