What are some alternatives?
When comparing Duke Nukem Forever and Perfect Dark, you can also consider the following products
Warface - Warface - is a free online shooter with diverse PVP modes, exciting PVE missions, outstanding arsenal and millions of fans around the world!
Insurgency - Take to the streets for intense close quarters combat, where a team's survival depends upon securing crucial strongholds and destroying enemy supply in this multiplayer and cooperative Source Engine based experience.
Hawken - Hawken is an Action, Free-to-play, FPS, Robots, Science-fiction, Tactical, Futuristic, MMO, Co-Op and Multiplayer video game created and published by Reloaded Games.
Metro Exodus - Metro Exodus is an epic, story-driven first person shooter from 4A Games that blends deadly combat and stealth with exploration and survival horror in one of the most immersive game worlds ever created.
S.T.A.L.K.E.R.: Clear Sky - S.
Unreal Tournament - Unreal is a series of first-person shooter video games developed by Epic Games.