The map is actually pretty good - there's much to explore, constant combat, good distribution of supplies and 6 or so tasks to complete. The map is much like a DM map, in that there are shortcuts and supplies stashed all over the place, so it pays to explore. Heal each other and try to stay together, as there's many snipers and not too much health or hev cells around.

As stated, this map is pretty hard, all the more so because there are no real instructions!!

Having lost twice I examined the map's entities, as a result I offer the following guide:

Objectives:

1) Fight your way from spawn through the horde of snipers, grunts and HWGs. Try to kill everything in the initial spawns, as progress depends upon elimination of certain enemies and turrets. (Later on, a few high-up snipers can control the re-spawning grunts fairly easily.)

2) Locate and retrieve the "Artifact", a small red alien pyramid thingy. (Look out for a basement Asian bar/restaurant not too far from spawn).

Watch out - the "Artifact" is breakable! If it gets destroyed, it's game over..

3) Locate the keycard needed to shut down the factory; it's in a room with a window and some grunts, again, not too far from spawn. Initially it can only be accessed via the back door of the room, so you must go the long way around.
Breaking the vent in the windowed room opens the whole vent system for map traversing.

4) Find the factory entrance, where there's a computer terminal which accepts the keycard - it's near a small section of working monorail. Use the keycard to shut down the factory.

5) Some random time between 1 and 10 minutes after shutting down the factory, an escaping 'evil Scientist' leaves a building door and runs a set path along the inter-building roads towards the biggest black hole in the outer map wall. He takes about 8 seconds to complete his escape - he must be killed before he reaches the black hole, or again it's game over!

Grunts constantly spawn, so the team must suppress them whilst waiting for the evil Scientist, otherwise the area quickly becomes overrun. Don't let him escape!

6) Find the three flaming chimneys, and in the bunkers of two of them, activate the shutdown switch for each one. (You need to have shut down the factory first, or the buttons do nothing.)

At the last chimney, there is no sandbag bunker, but instead 4 turrets and this time, two buttons. Shut down this chimney as before and then use the second button to call a satellite/airstrike down onto the "Croon" building (it's next to one of the chimneys).

One minute later the Croon building is destroyed in a spritey fireball and you can toast your victory marshmallows over the burning rubble!

If you complete these tasks, you will win with the 'good' ending..

:D