While not the most original FPS we've ever played, Darkwatch, this two-headed baby born of Dracula and John Wayne sports a unique, genre-bending storyline and some hefty firepower.
Lots of melodrama, some weird family relationships, and impossibly curvy chicks that harbor deadly ill will against other impossibly curvy chicks. It's a tempest in a D-cup.
The fast and furious, shoot-everything-that-moves, kill-or-be-killed frenzy of bullets, blood and demons is a shooter in its purest, most refined form.