Syphon Filter: Logan's Shadow review at Gamespot.

"Without a shadow of a doubt, Syphon Filter: Dark Mirror was one of the most impressive sleeper hits of 2006. It combined a decent single-player campaign with robust online multiplayer and rejuvenated an aging PlayStation series all while scoring a headshot for the struggling PSP. So its recently released sequel, Syphon Filter: Logan's Shadow, has a heck of an act to follow, which is exactly what it does. From the structure of the single-player campaign and the enemies to the puzzles and the online multiplayer, Logan's Shadow follows in its predecessor's footsteps like a sneaking spy. While it isn't likely to catch you unawares, you'll still be happy to act surprised."

Full Source: Gamespot