Well I'll just cover the technical aspects for now.
Framerate: slow. Insult to injury, they add a blurring effect in the distance when moving fast or when quickly panning the camera. The result is nausea and some lovely artifacting on the trailing edge of the screen. Nice.
Draw-in: bountiful. The video at IGN seems to suggest this isn't a problem in the final build. I guess we'll see.
Camera: hindrance. It was annoying up close to the colossus, but you get accustomed to it. Not really a problem. You become acclimated quickly. Riding Argo though, it still feels weird. Also "Invert" means two different things when talking about the free camera versus the weapon camera. I don't know what to make of that. Little demo snafu, I hope.
Controls: wonky. But you get used to them. If I didn't have a headache from the one-two combo of inconsistent framerate and useless blurring, I'd expound on that.
Argo: you get your own category, you polygonal sack of sinew. I can't tell if he's inebriated or about to retire. This is one unreliable horse. Call him, and he might show up. Odds are if he didn't follow you right up your ass the whole time, he won't be there when you need him. Like any horse, he is averse to suicide, so he'll avoid lethal falls. Surprisingly he'll still gracefully navigate the edge of a cliff. Try to ride him between some pillars, though, and he'll take a detour all the way around. You nut.
Art: beautiful. But the characters actually look worse in motion. Some sacrifice in the environment would have gone a long way towards improving the main character that occupies the foreground of your view to the entire game.
There isn't a hell of a lot to do in the demo. I'll post about the good points eventually.