Quake II is another excellent shooter from id Software and also completely unrelated to the original game, minus the name.
Doom is a rewarding and refreshing experience. The combat is fast and fluid with a sense of progression that keeps you addicted to the gameplay. While the multiplayer is nothing special, SnapMap should keep players coming back for years.
Wolfenstein: The New Order is an amazing shooter that does the series the justice with a great story, amazing gameplay, and superb voice acting. This installment breathes new life into the Wolfenstein series and is one of the best shooters of this generation.