I swear Team DM is the worst thing ever. No matter how many times I play it I can't get a grasp on how you're supposed to approach it. The game spawns you right next to the enemy most of the time, you can't revive anybody because you only have about half a second to do it, etc.
The spawns is what makes it chaos. They're apparently fixing that in some patch soon. We'll see. But I enjoy it in a casual-turn-your-mind-off mode.
As far as reviving: You shouldn't be doing that on TDM. You should be focusing on fast killing with maybe a few heal/resupply helpings when the coast is clear to do that.