That update was a good one, missions are far more attainable now.
I did a couple on the weekend, if you stay more than 600 meters away, and find semi decent cover, the AI will struggle to hit you.
They will start moving towards you and attempt to flank you, which is good. If you can't get them all quickly, you need to re position, which is a nice challenge.
Sniping is now a viable option for missions.