Warhawk first launched in the summer of 2007, while scrutiny of the PS3 was at it's highest. Released in between the critical flop Lair and the moderately received Heavenly Sword, Warhawk was largely overlooked, despite being a fun and well designed shooter.
Two years later, though, the title is still kicking and has finally hit the one million player mark, according to the online leader boards! Incognito deserves a salute for managing to achieve that number. They have been especially supportive of the online community, releasing several DLC packages to keep the game fresh.
Warhawk still mantains a very active community, so if you haven't checked it out yet, I encourage you to do so - especially at the Greatest Hits budget price!