how to play this game? 

Agent, Gear score 182 save to enter world tier 3?
Nowadays very difficult to matchmake. Seems like less people playing d.

Finally finished all the legendary mission...basically you are at the mercy of teaming with a good group. The hardest one to do is Warrengate due to confine environment and the timer during the 3 valves segment. At the end yolo all mission with a sentry sausage which surprisingly still relevant in pve. 
Stolen signal really need a tip top group to do.

Got shitload of shortbow kneepads.
Now back to grinding survival for DMR...my most wanted exotic at the moment.