These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Project Reality
Hell Is That Noise: Players on maps with jets on them will come to dread the whistle of an incoming bomb.
If you are a mere infantryman, which you will be for a good portion of your time playing this game, the rumble of a diesel engine with no friendly assets around may require a change of pants.