Marvel Rivals is the latest addition to the hero shooter genre, and may compete with Overwatch 2 in a big way. Of course, Marvel Rivals and Overwatch 2 are hardly the first shooters to butt heads. Back in the early 2000s, the military shooter genre was still in its infancy, with the FPS genre having only been popularized in 1993 with the release of Doom. Though Rainbow Six and Medal of Honor were some of the most influential single-player military shooters, the Battlefield franchise broke new ground in the multiplayer space. While Battlefield had a grip on the military shooter space for a while, Call of Duty 4: Modern Warfare quickly changed that, and a fierce rivalry began.