purpose of team deathmatch

dont understand how i wreck armys but still somehow lose? anybody know what the hell the purpose of this gametype is?

its a bug in the beta…one that ive never seen before

I’ve had it happen to me, it is a bug. You can be far ahead and wrecking the enemy but suddenly get “defeat” for no reason. Some people think its related to spartan jacking a vehicle (and this was likely the cause of my one glitch defeat.) However I have also received defeat 3 minutes in when I hadn’t even built a spartan yet and my base was untouched by the enemy and I had 3 marines and a sniper or two. So I’m not sure what causes it, but avoid using jerome the spartan if you can, he seems to be part of it at least.