Naval Assault features some of the worst production values I've seen on a next-gen console. The environments are about as boring as the gameplay; since Naval Assault is one of the most boring games I've played in recent memory, that's no small feat. There's a near complete lack of attention to detail; I would actually argue that this game could have appeared on the original PlayStation, and it would have been none the worse for wear. Explosions look canned and lame, the water apparently isn't disturbed by wake turbulence, and the smothering darkness that awaits you in the deep is almost oppressive.
The sound is no better; actually, it's worse. The music is mostly harmless, but it hardly serves its subject matter well. Voicework is universally awful; the lines are poorly-delivered and often completely redundant. Worse yet, it almost always repeats itself. I don't need to be told that enemy E-boats are dropping depth charges while they're exploding all around my boat. When each mission starts, all of the expository text is read aloud. I'm pretty sure Teenage Mutant Ninja Turtles: Turtles in Time was the last game to do that; if it wasn't, it was the last game to successfully pull that off.