Ok so... beat Doom. 14hrs, easy difficulty, did not actively chase collectibles/side objectives. Doom actually has quite abit of story to it, even without the need of reading all the collected pda tablets in the game. I got everything that follows from simply listening to the narrative as objectives were sent my way and in particular from the small interactive tablet things in hell where a Demon actually explained things.
The story follows the break so don't click this article unless you want to be spoiled!. Note : this is the story as I understand it, I did pay attention to it but could be wrong.
