Have you ever seen Ghostbusters? It's a comedy movie. They have a giant man made of Marshmallows attacking the city. I don't think they were going for realism.
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Anyways, this game is awesome. The first time I shot a ghost with the proton pack I got goosebumps. What's really awesome is your health and the temperature of your proton pack (you have a heat limit and you have to vent it to prevent from overheating) are shown on the pack itself. So the only thing that's on the screen is a money counter (for money you earn, and damages) and their faint ad only pop up when more money is added. It really clears up the clutter.
I've done three levels now, and while so far the story hasn't been great the dialogue is pretty funny.
Oh yeah, you can even slide down the pole in the firehouse!!! That was the first thing I did when i got a little free roam time in the firehouse.