Just trying out WarFrame, and it seems that on most missions the number of enemies is literally infinite. Areas that I have cleared out are repopulated when I get back to them. If I don't re-clear the areas, I'm attached from behind.
Is this indeed the case - are the enemies just boring distractions? Should I just ignore them, and kill only those that stand in the way? It's not like they're actually doing that much damage anyway.
I know the tutorial is rather weak, if not outright misleading.