It's multiplayer, but an odd format for it. For multiplayer, you wait in queue until a server has achieved an even number of player before you can enter. For instance, if you select a server that shows 18/32 players, you wait until one more signs onto that server before you can begin gaming. There are no odd numbers on the multiplayer.
No teamwork, no strategy-it's pretty much a pure shooter. You shoot anybody on the opposite team. One of the multiplayer formats was kind of cool; one team starts off with proscribed weapons. For instance, if you have 20 players on a side, only 10 will get assault rifles, 5 get only knives, and 3 get pistols, and two might go barehanded. You can acquire weapons as you kill somebody, but starting out unarmed is kind of tough.