ARS:
The first tank you face is barely cold when the game throws another one at you. If you separate from your group for a moment or two, expect smokers and hunters to tear you to shreds. Each of the 16 maps, including the all-new Last Stand, have strategies you can ferret out, rooms that are slightly easier to defend, propane tanks to place, health packs to hoard... but it doesn't matter. You're going to die.