Team Fortress 2 can support 12v12 (and larger) matches, but all of the tournament games are 6v6.
Plenty of other games as well, which I won't bother listing.
Not every game tries to mimic Battlefield's large scale premise... nor should they.
Also, Halo never supported 24 players. BTB was 8v8. Bungie has always made tournament-style multiplayer.
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Edited by AGENT Big O: 8/10/2014 7:24:59 PMOn top of that, CoD was not 12v12 either. It was 9v9 in ground wars.