What are some alternatives?
When comparing Call of Duty and Doom, you can also consider the following products
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.
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Overwatch - Stylized team-based FPS
Team Fortress 2 - Team Fortress 2 (TF2) is the sequel to the game that put class-based, multiplayer team warfare on...