if you stay with it... the best protip i can give is do the sorties within mere minutes of going live. if sortie 3 is annoying/hard (ambulas, kala de thaym [sp?], many defenses) and you don't have it completed within ~30 minutes of it going live, you're basically going to perpetually be stuck with a squad of morons/leechers through the rest of the night and you should just do something else, instead. this is moot if you have people you play with regularly.
i was good enough to solo 99% of content, but the 2 missions i mentioned generally required 2 competent players (hacking/defending 2 ambulas or shooting those stupid plates) or it's absolute hell with the bosses/dmg/etc scaled up for 4. last i recall, ambulas missions were the fucking worst because everyone was too incompetent/scared to hack them (ie: i had to do them all) and they were too incompetent to shoot the damn repair drones (ie: the most important part), so i basically had to do fucking everything (kill, hack, defend, revive squad) if i wanted to succeed. of course, once i realize i was playing with leechy morons (who also generally had entitlement problems), i'd just decide to sabotage the mission.
in short, if you're not a piece of shit and you don't expect people to give you everything/do everything for you, you'll be a shining beacon of hope in a game ruined by bad matchmaking and leeches.
that said, i uninstalled it ~6 months ago so i have no idea if they fixed any of that shit. the matchmaking/host/network problems were massive.