Gamespot gave SH4 a score of 8.3/10
The Good: Highly scalable gameplay that lets you be a submariner in the Pacific; single-player career mode offers tons of challenging and changing gameplay; multiplayer support lets you team up with others or play as the escort; excellent production values make it seem as if you're really at sea.
The Bad: Stability issues and other bugs, though an initial patch has addressed some of these issues; artificial intelligence is a bit uneven.
Link:
http://www.gamespot.com/pc/sim/silen...r4/review.html