Pros:

1. The second map of this chapter scenery was beautiful, the sky colo(u)r was charming.(as your screenshot you see);
2. The escape route wasn't complicated, I never get lost while I played this map first time;
3. Although the textures were monotonous, but it didn't matter;

Cons:

1. Hong Kong was left-hand traffic country, the cars run along the left side, not the right side(as Japan), and the people use British English, so "Computer Center(電腦中心)" was "Computer Centre";
2. Opposite, the map 1 difficulty was too hard(the hordes never get stopped), and the map 3 finale was too easy(Tank won't appear in the finale);
3. In the finale(map 3), the computers won't get on the helicopter, you need to make them incapable to quit the area.

Conclusion:

I've linked your map "Hong Kong" to my character mod "SDU Coach"(you can search for it on L4DMaps or Workshop), SDU was the well known Hong Kong special forces, I thought it matches with this map.

I really like this map, I hope you can promote this project, fix up some bugs(as the computers won't get on the rescue chopper), you can replace the helicopter WITH a rescue BOAT.

Pros:

1.Amazing drama of this map, like the hell really came to earth;
2.Awesome background sound;
3.Amazing Intro with slow motion;
4.The finale combat was really very very intense, we gotta encounter more than 5 Tanks!!

Cons:

We were frozen and attacked while the animation(Intro) was playing.

Conclusion:

I really like the background sound of this map, pretty good!