Demo is pretty massive (as for few minutes gamplay) also because it contains one of the previous trailers. Don't press anything for a while on main screen of the game and you'll be able to watch it.
Seriously I played many times through this short demo and this game is really, really deep. I'm totally shocked some people have mixed feelings. My expectations was set really high and I'm totally pleased with this game. No bias, no high hopes - just complate package (graphics, sound and gameplay).
Also most people scored a demo so I can accept this 7.0 (indeed it's really short). If anyone score whole game below 8.5 it will be a crime against peace and security of mankind...
Edit:
I like the fact you can't blow off everything with chained swords easily. It's the weakest weapon and main purpose of it is defense. It help you get rid of some dudes...
I don't find AI stupid. Some people probably expected that everyone will attack you same time and this "idle stance" annoys them but it's like in real life they would interfere each other.