Half-life, Fallout, etc etc... taught me that the worst possible place to be during any major castrophe is the Metro. I have tunnel-phobia now. This game would help me overcome my fears. The video card would give me something to beat off the mutated sewer rats.
Why not? Instead you should be asking yourself why. Why would you want to pack yourself into a small space with dozens of other people who may or may not be out to stab you and take your belongings because you have such awesome stuff... like.. an Ipad or whatever people get stabbed over these days.
If you however are interested in seeing some of the strangest things you can possibly see outside of the bowels of the internet by all means expose yourself to the insanity that frequently is public transportation.