I first want to ask if the mission briefing before each game actually does anything. I see no text and hear no audio.
I have tried a few of the challenges and in my opinion the shotgun and sniper rifles are next to useless. In the pre release in August, the shotguns were too powerful and did deserve to be nerfed.
The sniper rifle does not do enough damage per round. I can routinely out run a sniper firing at me. When I try to snipe someone it is always infuriating unless they have already sustained significant damage prior to my shot. The drone is interesting, but I need more time to evaluate it. In 2042 I was able to use the drone very effectively.