Pros:

Challenging
Snow effects
custom voice on radio

Cons:

to long
no proper signs telling ur where 2 go
no clear sign on when the final hoard has been started
wat to meny alarmed doors, lifts ect

Conclusion:

If u can show the route we are sperost to take more cleary and no so meny alarmed sections then u would have a prety good campain on ur hands their but till then im ganna have to give this 55 :(