Pros:

Variation on the PORTAL theme, albeit much, much darker.

New take on the infected survival concept.

Cons:

Puzzles all consisted of 'locate this, set on switch (optionally, explode), move forward.'

Voice over of the computer system was a little hard to hear.

Conclusion:

This was a pretty wicked map. I enjoyed it thoroughly, despite its repetitive nature. For a co-operative experiment, however, there really isn't much need for the players to co-operate beyond carrying multiple items to the button should one be destroyed. Regardless, I still had a fun time and will be playing this map again.