It's a decent game, but its not for everyone.
Although I've been looking at the high points of Pariah there are definitely more cons than pros. Firstly the frame rate in pariah is slow, the graphics are mediocre and the weapons are boring.
Secondly the story of the game sometimes makes you feel like you missed something important in the game and when the characters talk you think to yourself " Am I supposed to know that?".
Finally, probably the worst part of pariah is the A.I. I found myself once beside a enemy with a gun pointed at him and he didn't even notice me, and even sometimes when you are trying to sneak past an enemy they sneak past you without even looking at you and for a xbox game that is pretty bad.