Great innovative gameplay, along with Great controls make a Awesome game, and not to mention the Assassin theme.
I was trying to decide which game to get, this or Mario Galaxy, and luckily i waited with Mario, and picked Assassins Creed.
Gameplay : Great original gameplay, you play as the Assassin Altair most of the game, but really you are Desmond Miles a bartender taken in for research, it seems the memory of his ancestors are stored in his DNA, and he undergoes this memory recovery program, where you get to play the Assassin in the year 1191, and so the story goes, i won't spoil any more than that. Assassins creed utilizes the ability to climb anywhere anytime you want, which makes you feel very free and not restricted to a linear story.
The Story is not very captivating i mean it isn't bad but its a bit hard to hold on to, but with such great gameplay its the least of its problem.
To progress in the Story you must assassinate high rank targets, to get to these targets you must complete small tasks around the city to learn more about the target, then you can proceed when they are done.
Graphic: Beautiful Graphics, and with a HD its only more amazing, Huge cities with very high details to small things and larger things, Character models look excellent, it doesn't feel like you are looking at identical people all the time its very nicely varied. Also Altair looks awesome
Sound: Superb music fits the environment perfectly. Great sound details everything, nothing to complain about.
Controls: Excellent controls makes it very easy to jump from building to building, and escaping. Fighting while simplistic using only the X button to attack, you can block, throw and also reverse enemy attacks so you kill them instead, i think its pretty good, even though its a little easy at times.
AI : AI is good, enemies follow you well from rooftops to streets, and they loose sight when you are out of sight, which is realistic, haven't noticed any poor AI so far.
Story : Like i mentioned before, the story isn't much to grab onto, its not bad but it could use some polishing, its incredibly long however, up to 40 hours or more, depending on your play tactics.
Bugs : noticed a few bugs here and there, nothing major, just some weird and funny moments.
Achievements : Loads of time consuming achievements for the 360 version, from collecting a whole range of flags, to killing X amount of guards, and so on, plenty to keep one busy.
Conclusion: Loved this game, very addicting, running on rooftops jumping around never gets old (so far), neither does assassinating people!. Definitely a game you should get if you like Ninjas!