According to ESRB, this game contains: Blood and Gore, Intense Violence, Nudity, Strong Language, Sexual Themes
Parents should be aware that this game is not for children under any circumstances. The violence is extremely brutal and graphic, featuring many different kinds of fatalities and explicit slaughter. There are also several instances of topless or nearly topless women, although the sexual situations listed on the box's ESRB warning only occurred one time, (and were very low key, without anything graphic). I did not notice any strong language during the game itself, but in the commentaries given by the developers afterwards there were a few expletives used. This game is obviously aimed at an older audience, so do not make the mistake of getting it for younger children or those who might be sensitive to such content.
Action gamers will definitely want to check into the title. It's one of the most solid hack and slash adventures that's been created, and the effort and thought that went into making it shows. The controls are tight, the action moves briskly, and there is certainly no shortage of flashy maneuvers or entertaining violence. Without a doubt this is one of the most brutal and bloody adventures on the PlayStation 2, but it's not just for show—the gore is also backed up by mechanics that hold up under scrutiny. As far as I'm concerned, it easily eclipses Devil May Cry or the Xbox's Ninja Gaiden.
Deaf and Hard of Hearing gamers are completely screwed. There were no subtitles or text during any of the cutscenes or dramatic moments, meaning that the game's plot is completely inaccessible. This was an extremely disappointing choice, especially in light of the fact that the developers went the extra mile on nearly every other facet of the game. Being cinematic does not necessarily mean removing all text from the game during play, and it would've been a very simple thing to include this option. There are no significant auditory cues during gameplay.