Keep in mind that I played this on a SDTV and have always been supportive of this game...
With that being said, I thought the demo was very good.
Graphics wise, the game was just good. Not breathtaking, but no noticeable framerate drops during gameplay. While there was some stuttering in the menus and cutscenes, I can live with that if it means no loading. I also thought the art direction was very good. My only complaint was with the beserker (??) dudes (the ones with the axes). They look like they should be in the WWE instead of a game based around ancient Norse Mythology.
The musical score in this game ROCKS. I also thought the sound effects were extremely good.
The combat really surprised me. While I don't think it will be incredibly deep at high levels, I had a blast zerging through the first groups of enemies. It was tough adapting to the right stick combat at first, but when you stop fighting with the controls, everything comes together. The camera during combat really did not frustrate me at all (played mostly in the strategic and isometric views) and with the combat being so frenetic, I forgot about it completely. Only when exploring did the camera really get on my nerves despite the option to hold the RB and stick to free look. This is a game that will allow casual players to feel like a badass and tank through the game while at the same time rewarding skilled players for effectively using all the skills at their disposal. After two playthroughs, I still struggled with the air combat.
I liked the presentation quite a bit, especially the flashbacks which is a different spin on storytelling this generation. While I thought some of the facial animations were rough, the voice acting, in my opinion, was solid. In terms of the dialogue, some was cheesy, but definitely no cheesier than anything from Mass Effect, Halo, or Gears. In fact, one of the lines being criticized here by some "It's a good day to die" was what seemed to me sarcasm by SK.
Loot system was obviously stellar. Don't need to go into this.
Biggest complaints....1. Camera system when not in combat
2. Invisible Walls
3. AI partners
4. Some of the characters art design