Well, describe them in general, or describe each of them in detail? That is, are you looking for impressions on how good the fatalities are, or are you looking for detailed descriptions of what happens in each of them? If you're looking for the latter, I'm sure you can find some FAQs with descriptions of them...

mavado has a cool fatality he uses his rope things then he raps them around your neck and your head all swells and stuff and BOOM.

Sub Zero freezes the entire universe then does Jax's ground pound and it splits in 2.

There are some cool fatalities:

Scorpion throws his spear into the opponent's nuts and pulls them out and then eats them.

Bo' Rai Cho does a little dance first and then he unleashes hell by dropping his pants

And so it goes on...