Bungie (or a company with the same name) used to know how to make all kinds of great custom game types and gave players the tools to forge custom game types/maps. They also used to know how to make great vehicles...
-SWAT comes to mind
-Grifball
-Shotty Snipers
-Living Dead
Doesn't really matter unless they go to dedicated servers for at least the pvp
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That's what my friends and I couldn't understand about this game. They went from Halo, with it's plethora of game modes to this, where a majority of the modes are simply TDM with an optional objective.