Lv 60 now, from Lv 30-60, always playing season missions converted from Intel, but I found the keys are never enough to cover the boxes in Class 2 missions. So I keep playing Class 1 mission again and again.
And Class 3 missions are so rare that I only got one Class 3 Insignia with several hundreds of Class 1 Insignia dropped. I didn't use it because for most of time I don't have 5 keys at hand.
I met the new boss Soulgrinder once, in Class 2 missions. Quite a thrill. It's a regret that we could only fight him with so little chance.
Please, if possible, consider to have higher drop rates of Void Plunder Key, and Class 3 Insignia . They are something special for this season, right?