im about 10 mins into the game and ive played the demo! i think gamespot were a little harsh on there rating.. i'd give it a 6.. any ways u can pick this game up really cheap now. i paid £8, thats a deal!!!
It definitely isn't a poor game, much less a terrible one as IGN/Gamespot and others have said it to be. You're right, it should be known with a 6, and the reason for that is because of the animus mechanic, weapon balancing, and creative bosses.