I downloaded the demo for both 360 and PS3 today to get some more thoughts, I'm a massive DAO fan on PC (never got it for consoles) and felt pretty gutted by the awfulness of the DA2 demo... and now I see why they made all these changes. The game is fantastic on PS3, you press 'X' for every swing/attack animation - so if you only press it once your character takes one swing and then does nothing. This makes the fast combat WAY more interesting since you're actively involved the whole time, sure it's a little "button mashy" but it's fun and the skills are great and easy to use.
It really is an action game on the consoles, for better or worse. But in this case, compared to the PC version, it's very much for the better. I had an absolute blast playing a Rogue on PS3 because you attack so quickly and it's very easy (and fun!) to switch back and forth between targets mid-combo.
I'm impressed, as for XBox vs PS3 it looks like the PS3 has AA and the 360 version does not. It's definitely interesting... I'll give the PC demo another run through now that I feel more comfortable with the demo itself. I'm a little nervous at how few talents/spells there are in the various skill trees, at first glance they look plentiful but upon closer inspection many are simply upgrades to existing talents... like the Elemental tree has Winters Grasp, Cone of Cold, Fireball, and Firestorm. And I think that's it!! Scary, DA:O had so many more options by comparison... I have not looked any deeper than a quick glance so hopefully the earth and lightning spells are still there but in another tree...
If I can't come to grips with the PC version I know I'll still love this game on PS3. Graphics looked entirely comparable to the PC demo too, though the PC had several settings disabled for the demo.