According to ESRB, this game contains: Blood and Gore, Intense Violence, Sexual Themes, Strong Language, Use of Alcohol
Parents should steer kids clear of this game. The bulk of play involves gunfighting, and it can be graphic at times. Heads explode, limbs are severed, and it's possible to scalp a downed opponent with a healthy gout of blood accompanying. Later in the game, there are scenes of dead bodies on display which had obviously been tortured, certain characters are executed, and one poor gentleman has fingers shot off in an interrogation. The main character restores his health by taking swigs from a flask, so people sensitive to alcohol usage should be aware of this issue. There are also several examples of salty language, and although there is no explicit sexual content there are a few references and the saloon girls are scantily clad. Basically, this is a game aimed at mature players, so please treat it as such and be aware that much of this material will be inappropriate for younger people.
Action gamers will find a standard GTA-style skeleton fleshed out with Western trappings. The game is short, the main quest easily finished in six to eight hours. Adjusting the difficulty settings will provide the appropriate level of challenge, and I strongly recommend exploring the side quests. In my opinion, these are what make the game what it is, and anyone skipping over them will be missing out on much of the game's appeal.
Fans of the old West will most definitely want to pick the game up. It doesn't have the same cool factor that Red Dead Revolver does, but it's way more solid and deeper all-around. Straight up, this is the best Western game out there, although it sort of wins by default.
Deaf and Hard of Hearing gamers will have no problems. Gun offers full subtitling for all cutscenes and voiceovers, providing for a very smooth and playable experience without audio. The game also provides a small radar function to aid in the location of enemies, so there are no vital auditory cues to trip up hearing impaired players. Neversoft has done an excellent job in this regard. Top marks for accessibility.