To make a game good its not just guns.Some puzzles and a really scary or cool moment would help.Ill use unreal 2 as an example again.Basically when ur in an elevator a skaarj attacks it from above.And the elevator fills with water.You think ''WTF??Oh shit'' eventually the door opens.another cool moment is when youre in a secret lab you dont have a security card.Some turrets tell you to drop youre guns in 30 seconds or be shot.The guns started moving and the barrels were slowly starting.But they stopped and opened due to his hacker friend.Those are examples.Also I think Beyond good and evil has Tons of cool moments.If they could add that into doom it would be so much better.But if it doesnt expect me to buy one of the newer games like PsiOps or Area 51.Mainly cos im a monster/mind control lover and in area 51 theres a pic of becoming an alien
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