Allow me to go further and point out that the person behind the Steam profile you linked to hasn't even completed the first map of the single-player campaign according to the Steam achievements. No matter how you play, you can at least manage to do that in nine hours. I believe that the person has apparently only played Doom multi-player and now stands at least on level 5. This is pretty weird because the multi-player is poorly designed and the worst component of the new Doom package. Many gamers I know hate it with a passion, mostly because of its low skill ceiling where you don't even need to aim properly to score frags.