The initial stage of the map Dirty Bomb / Attack on CCity for the Security team is extremely unbalanced and needs fixing. It is far too easy for a competent Resistance team to bottle up Security in their spawn and end this mission in the first stage. This mission is quite long with plenty of challenges for Security along the way - theres no need for the first stage to be as tough as it is.

"Hey, noob, learn to play! Just co-ordinate and you can get the first stage done."
Not true. Yes, if security is a full team of players who really know their roles, you can get through the first stage. But in multiplayer you are almost always with random folks, many of whom dont often know what they are supposed to be doing. And even with a good Security team its remarkably easy for Resistance to stuff them in their spawn.

Suggested fix:
Add a third way out of Security spawn that provides an overwatch position for the team trying to set the charge on the barricade. If Security could get on top of the containers just to the left of their spawn and from their provide covering fire the first stage would be much more doable.

I play Resistance a lot and if Security makes it out of the spawn it is shameful to us. We have mines, turrets and our whole team just camping right outside the only two areas they can come out of and no super turret to stop that. Too easy really. It's a shame because the crane part is fun if Security can get that far.

The health command post gives resistance a huge advantage at this part as well.

As far a fix... well. A 3rd way out of the spawn would help, or a wall between the two exits, if the defense had to split between two areas, security would be able to push out easily, but only one of those directions would push to the gate.

/bump