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)