I'll state myself clear.
The beauty of Doom, in my humble opinion, is the struggle of a single soldier against the unundestandable, and unimaginable forces of hell. It's the war between humans, and something that is beyond our imagination. It's the feeling of hopelessness, when the soldier understands that he is "on the shores of Hell, and the only way out is through". It's the feeling of complete loneliness, and the feeling of complete resignation. The wierd war between one man, and something he never thought could exist. It's something magical, uncomprehensible, unknown. It's like the old stories of Howard Phillip Lovecraft, where the puny little humans battle against the illogical cosmic forces of the Old Ones.
It's not only a bloodbath. It's a story about sanity.
Doom the movie has none of it. Absolutely none. So for me, Doom the movie, is another Aliens movie, with known actors starring as the Aliens. But there is no Doom there.
Consider the name Doom itself. Doom is named Doom, becase of the feeling that the world is Doomed. Where's that feeling in the movie?
Needles to say, that's also the reason I dislike Doom 3. It lost that feeling of a world beyond mortal comprehension, it lost the feeling of total doom...