Pros:

Good idea
Liked lift
Nice houses
fun to get stuck on the lift with a hundred infected trying to get you
cool guns

Cons:

not a good way to start the trigger event
wish you climb to the top of the lift
outside scenery not so good

Conclusion:

It is a good survival map, but instead of the survivors triggering the event by getting out of the box make them use the lift so they would be able to get through a blockage in the slope. I mean the lift makes a hell of a lotta noise. And add some snowmen :D