Remember your solo mission to light up a few tanks in the fourth mission? You can revisit that bombed-out city in all its debris-ridden glory on the multiplayer map version. Unlike the solo map, which gave you a linear path, the multiplayer map has no beginning or end, and you can climb through the blasted buildings and run around the shattered streets to your heart's content. There is so much cover that the enemy could attack from anywhere. Be aware of your surroundings and always have an escape route planned in case of disaster.
There is one key area here to control. You want to grab the ledge in the middle of the map. It provides a good vantage point with great cover. Take a buddy along to cover the only entrance up here, though, as someone can sneak up on you from behind.
If someone gets up on the middle ledge, the best way to take them out is to toss a grenade up there from right against the wall, or to use an airburst grenade from far away.
Be careful, though, the map loops around so there is no start and finish, and what might have once been a street section could now be a dead end.