If you're going to try and compete in a genre as saturated as the sci-fi shooter, it's a good idea to make your game stand out.
Make it the best looking with astounding boundary-breaking technology that really brings it to life, give it a gripping story that drives players through the game, make sure the combat's intense, challenging and realistic, and score it with drama and flair. Give gamers no choice but to buy your game, and leave critics breathless with enthusiastic excitement.
The problem for Pariah is that it fails to even come close to matching any of these benchmarks, never mind bettering them. It's a game that's really very hard to get excited about. Solid, but so very unremarkable, and beaten to the punch in so many areas that makes it hard to recommend to all but the most hardened shooter aficionado.