Richcz3, do the many press conferences and displays made by ID stating that DOOM III will be directed towards single player and that ID couldn;t really care less about multiplayer even ring a bell. And I suppose the fact that DOOM 3 won "Best of Show" 2002 E3, and has been and still is atop the lists of most wanted games in magazines like PC Gamer and on websites like GameSpy. ID is doing what no other company can do and that is develope a single player game that people will want to play, the whole idea of Doom III is to create a blockbuster title.
And to the comment before this one, Doom III will not blow, however, Half-life 2 won't either, both are going to be instant hits, and to tell you the truth, the people who buy one will buy the other, because true gamers support even the smallest of titles and will sample everything, for all you know, Half-life 2 gameplay could be the shitiest thing in the world and like many movie previews, you only got to see the best parts of the game in the E3 trailer. Don't bash before you've sampled there buddy. :-D