User blog comment:Drkdragonz66/Black Ops II - 8 Players and Zombie Story Mode hinted/@comment-1854594-20120504050953/@comment-1263839-20120505151417

Halo, Battlefield and CoD (especially the former 2) are extremely influencial in the gaming universe. I can't imagine an fps developer not wanting their game to be as good as a Halo game or be as realistic as a Battlefield game. It's natural to see somebody go overboard and seep in many blatant attempts.

The irony is that the big three have always been in competition to see who's the best without even intending to. This leads to them taking aspects of each other with the next game (i.e Sprint in Halo: Reach, Infected, Theatre, Playercards, Survival esque mode which draw inspiration from Campaign in Call of Duty: WaW/MW2/Black Ops/MW3 and setting a game in the far future in Battlefield).