I rarely review things, but after reading the negative reviews, I felt obliged in this case. People are complaining its similar to Assassins Creed 3. Tell me, what did you expect? Now let me be clear, this is no GTA 5. But that's because its not meant to be! This game is designed with a completely different aim. But enough of that, let me get into it.
Gameplay: Now if your a fan of any other Assassins Creed game, your going to love this one. All the free running and movement has been refined, I have noticed very little of the bugs that used to annoy me all the time - I am yet to plunge fifty feet to my death accidentally jumping the wrong way because of bad controls - even after several hours of gameplay. Assassinating is as slick as ever, and having four guns as opposed to one finally makes them worth shooting! If you enjoyed the Naval battles on AC3, this is definitely for you! So much of the game is based on the open sea, but only if you want is to be. Sure, many missions involve boarding and plundering a ship, but if this isn't your cup of tea - though it is great fun - then you can stick to the cities for the most part (the 3 main ones all being large enough). I haven't yet reached the main idea of harpooning in this game, but thats probably because i spend most of my time causing havoc in Havana, and if the rest of the game is anything to go by, it will be good.
One thing that has been greatly improved is the stealth aspect in this game. It is possible to do almost every mission without entering open combat, and for this I greatly applaud Ubisoft, as stealth had all-but been abandoned in Assassins Creed 3.
However, while everything as been refined and added to, apart from the Naval battles, there isn't a huge amount of new features here, so if you don't like captaining a ship, I would have to recommend you stay away from this one.
Graphics: The graphics in this game are breathtaking. Even on Xbox 360, and I cant wait to see them on next-gen. If i compare it to AC2 (my favorite AC game) they are amazing, but however, if you played AC3, there really isn't that much new in the graphics department, as they were extremely detailed.
Storyline: Reasonably predictable overall, but it's always interesting to learn of Edwards struggles throughout his life. The new Abstergo modern day events that have taken over from Desmond are just about perfect - I personally find them interesting, but they never take you out of the game for too long!
Multiplayer: Not a big multiplayer fan on the AC games, so havent played it yet.
Conclusion: I would give this game an 9/10. Its an excellent game, and any die-hard fans of Assassins Creed will love it. Even if you simply enjoy playing them once in a while, I suggest you pick this one up. It has great gameplay, a decent storyline, and kept me glued to my TV for 4 hours straight when i got it today.
Ignore the other 'supposed diehard fans of AC' and look at it this way. If you enjoyed other Assassins Creed games (here I mostly mean the Ezio era, as many agree AC3 was a step back) and you liked the naval parts of AC3 then you will enjoy this one. If you don't like the Naval Battles, or the Assassins Creed format in General, stay away from this one.