If you are above the age of fourteen, you will no longer be excused for your exclamation point abuse. Just what is exclamation point abuse?
Why, using one at all.
If you are writing a novel, you are allowed one exclamation point for the whole thing. There is another rule: you are allowed to use three exclamation points over the course of your lifetime. (I guess that limits you to three novels containing one exclamation point.)
Why? Because your words should convey the power of what you're saying, not smiley-faced punctuation.