Suspenseful Gameplay
The AI also comes at you hard at moments. They'll teleport and attack from behind you, and some of the later enemies are fierce and extremely scary. My favorite aspect, presented later in the game, is the soul cube which kicks complete ass. After four or so kills, the soul cube can be used to wipe out any enemy you shoot it at and will instantly replenish your health.
This game was fantastic, but my only complaint would be it got a little too repetitive towards the end of the game. The bosses do mix it up however, so it isn't too much of an issue. All and all, this game is completely worthit and will leave you wanting more Doom (they have an expansion for anyone who's been living under a rock for the past few months).