What are some alternatives?
When comparing Hexen II and Counter-Strike, you can also consider the following products
DotA 2 - Dota 2 is a Free-to-play, Action-Adventure, Multiplayer Online Battle Arena, Single and Multiplayer video game created and published by Valve Corporation.
Battlefield - The latest news and updates for all things Battlefield, the EA and DICE video game franchise.
Quake - Quake is a series of first-person shooter video games released by id Software.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
BioShock - Get the latest information on BioShock, BioShock 2, and BioShock Infinite
Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.