
I can't tell you the hours that Allison and I spent annihilating each other in Ruin (the temple). If you could get the grenade launcher and pin your opponent under the ramp when they would go for body armor, you'd always get a kill. Ahh, the memories.
If you would like to get some strategy on the story mode of 'Perfect Dark Zero', check out the Lunabean 'Perfect Dark Zero' Walkthrough and Strategy Guide.