Devil Daggers is an irresistible Sisyphean nightmare. [The A.V. Club]
It’s an endless first-person shooter where you run around a floating arena and try to kill everything that moves before they kill you, which usually happens in under 60 seconds until you get the hang of things—and even then, you’re lucky to last much longer than that. The only weapons at your disposal are your wits, your agility, and the infinite daggers you can shoot from your hand in either a concentrated shotgun blast or a machine-gun-like hose of death.[more inside]
Are modern first person shooters a bit too serious for your taste? Be happy they weren't always made that way. [Pre vious ly.]
Zero Punctuation reviews Battlefield 3 (video), possibly the most reviled game ever to earn itself 93% on Metacritic. Remember to press X to not die (TV tropes).
Basics of effective FPS encounter design (via F.E.A.R. and F.E.A.R. 2) is a detailed analysis of how to create engaging encounters in first person shooters.
AssaultCube is a free first-person-shooter. Set in a realistic looking environment, it's fast and arcade-like. Available for Windows, OS X, and Linux (via)