Hell

Hell in DOOM
Hell is an important part of the Doom universe, being the source of all the monsters in the game. In the original and Ultimate Doom, all of Episode 3, Inferno, takes place in Hell, where it is depicted as predominately brimstone-covered with a fiery sky, complete with a demonic cathederal and pools of blood. Doom II's Hell levels are closer to subverted human buildings, with the exception of MAP28: The Spirit World and the last level, Icon of Sin. In Doom 3, the Hell is present also.

Hell is reached in Doom stories allways due to a failure present in the developing of teletransporting technology.

Without Hell
Many fans of the Doom game were dissapointed from the movie and the novel mainly beacause their stories replaces Demons from Hell with space mutants.

This is the main reason of the criticism of the Doom Movie and the Doom Novels.