Assassin's Creed III is the colonial installment of the overreaching story of the Assassin's Creed series. The player is an Assassin (for those uninitiated into the series, think Batman in a white and red or white and blue hooded cloak, pictures are included in the site's review of this very game.
Plot: Desmond Miles, following the events of previous games, has located an ancient temple belonging to the precursor race that came eons before humanity ever arose. Using the Animus there, he must travel back through the memories of his colonial ancestors to find a key. A key, that would let him access the core of the temple and save the world. You start out as Haytham Kenway. What Kenway actually is becomes known in a plot twist at the end of his portion of the game, but not before he is revealed to be the one responsible for the failure of the Braddock Expedition. The rest follows Rattonhake:ton, a Mohawk Native American with British ancestry, who adopts the name Connor Davenport. Connor goes on a quest of vengeance to kill the Templars who burned his village down. Along the way, he plays a major role in events such as the Boston Tea Party, The Signing of the Declaration of Independence (although he was just a bystander for this, looking on during a cutscene), The Battles of Lexington and Concord, the battle of Monmouth, the Battle of Yorktown, and more.
Fun: The game is lots of fun. Swashbuckling in the streets of colonial Boston with endless waves of Redcoats is very entertaining. The historical battles are great, and there is that moment of "wow" when you raise the American flag in forts you've captured.
Violence: Plenty. You have access to a variety of historically accurate swords, tomahawks, axes, and daggers, as well as the Hidden Blades common to the series (basically, a wrist-mounted device that contains retractable daggers). You also have access to a Bow and Arrow, a Rope Dart (which can be used to strangle or hang your unwitting opponent), a Poison Dart (which paralyzes an opponent after causing them to wander aimlessly while waving their hands for a minute or so), and Flintlock Pistols (which take ten seconds to reload one shot, so they can really only be used once per fight). Although blood can very easily be turned off (a fact commonly overlooked), when blood is on, it will splatter, get on the ground, your sword, your clothes, your enemies clothes, etc. Each strike or shot, no matter if armed or with a weapon, will cause blood to spurt from the enemies wound and/or mouth, depending on the injury. When fighting near ledges, attacking will sometimes have the player character kick their opponent off to their deaths. When enemies are about to fire muskets at you, you have the option of grabbing a nearer foe to use as a human shield. Some attacks will automatically trigger when the opponent is near death, and can look violent (slashing a foe across the chest for times, stabbing your sword through their head and/or neck, stabbing them in the jaw with your hidden blade and dragging your sword across the side of their neck, etc.). You can also employ stealth to do things such as stabbing your opponent in the neck from behind, choking them out (which is non-lethal and can only be done while unarmed), stabbing them in the back with your hidden blades (if you do this, they will stay on their feet for a moment, look surprised, and then collapse). Citizens will react in horror or egg you on while playing witness to a swordfight between you and the city guards. Pointing a gun at a citizen will reduce them to a quivering, panicked, terrified mass. However, if you actually kill too many civillians or household pets (which you can play with, ironically), you will lose. In a modern day segment, you briefly can fight Templar guards with an automatic handgun.
Sexy Stuff: I've played through the entire game (The Washington DLC not included) and have not seen anything, aside from a brief scene depicting a woman in her underwear and man in his underpants and a shirt (the whole thing is played more for comedy than anything else, it should go over most younger kid's heads).
Language: Frequent use of s--t by citizens. Roughly three uses of f--k during the storyline, as well as the word c--k. The sentence, which occurs in the first few chapters of gameplay is: "Perhaps I'll take your hands, to stop their doctoring. Or I'll take your tongue, to stop its wagging. Or maybe....I'll take your c--k, to stop its f--king!" The character Desmond Miles (in the present day storyline), says "f--k you" to another character, as well as one other instance of the word which I forgot.
Positive Role Models: Connor may be an Assassin, but you have to remember, Assassins are the good guys here. By eliminating one enemy (which the players sometimes have a chance to do in open combat), the Assassins hope to save millions of lives from the evil Templars. Connor is also a freedom fighter, who fights to save his people and to bring freedom to the colonies. You do end up killing several real life important historical figures, such as John Pitcairn, Thomas Hickey, and Charles Lee, among others. This is justified, however, in the sense that they served the villainous Templars, and the real-life characters themselves weren't necessarily good.
Political Concerns: The Tyranny of King Washington is some bonus content you get if you pay the full $60.00 for the game on Steam. Basically, it follows an alternate timeline where George Washington becomes power-mad after winning the Revolutionary War, becomes a king, gets a magical scepter, and wipes out Connor's tribe.....again. Connor then gets superpowers by drinking tea, because things didn't seem to be weird enough. Case in point: if you feel very strongly about our founding fathers, you MIGHT want to steer clear of this DLC. It's fully optional, though, you can still pay the sixty dollars and get the small army's worth of unlockable weapons, outfits, and other nice things. Also, if you aren't American, it is worth noting that several British historical figures die during the game by your hand: Edward Braddock, John Pitcairn, and William Johnson being just a few examples. You additionally kill some patriot traitors, such as Benjamin Church and Thomas Hickey. Just some things to watch out for.
Positive Messages: Connor does stand up for freedom throughout the game, and comes off as a very heroic character.
Educational Value: It is a very historically accurate game. The play being performed in the opening sequence is a real, actual play that was performed back then, and was considered controversial because it was a comedy set in a prison. The Animus Database in the pause menu contains factual information about events and places, and is written in a humorous style that children will enjoy.
Conclusion: I hope my review helps you make up your mind. Don't let blood itself deter you, it's a great game, and it could be an interesting idea to play through it with your kids, if you want to try and get them interested in history.