It's nice though that the monsters can also attack each other. For example, if someone shoots at you, maneuver yourself in front of another enemy and cause him to get hit. He will then proceed to take revenge on the sniper. I expected more here. The cool shotgun reloading sequence from the original is gone.
Explosions are also a letdown.
After seeing what the N64 can do with bitmap explosions in Turok and Blast Corps, I was really disappointed. There are also four different difficulty settings. While playing, I yearned for the freedom that Turok or Mario 64 offered. Sure, this is Doom after all, and Midway wanted to preserve the classic gameplay, but I think it's time for the series to move on. The second major problem with Doom 64 is the lack of a multiplayer mode.