The team AI on your own team is so poor it makes a tough challenge all but impossible, they are stupid, they run out and die under a hail of fire and can't support you whatsoever. Whereas when I look at the enemy team they are pretty much perfect, they storm the objective, they take cover, they are always cohesively defending the objective. Why can't my team be like that?
I have no doubt with enough attempts I can beat all these challenges but it's going to be like pulling teeth. If this was going to be case all along then why didn't SplashDamage allow unlocks even with a team of human players? I can imagine this turning people off the game a lot.
Apart from that I do love the game, great gunplay and parkour fun.