I wanted to give my impressions of the PS3 demo.
The first word that came to mind is "choppy" to be honest. The frame-rate seemed ludicrously low to the point I started feeling ill. I can't be certain but it appears the frame-rate often dipped well under 30fps, likely into low 20's. However, this wasn't uncommon for ME2 to do the same thing on the PS3 so I'm inclined to believe it'll be the inferior version and I imagine the PC and the 360 versions will be smoother.
Then again, it's probably better to play the series on those anyway; get the full experience by playing ME1 as well. ME2, even with the "ME1 comic" assumes you were mostly Renegade if you didn't play ME1 as a Paragon: Feros for example was practically wiped out, and the game later shows that you killed Shiala.
Otherwise the demo was about what I expected: Two quick missions, the game's introduction and a later level. Nothing to write home about, but certainly nothing to sneeze at.
What did impress me was the improved face creation elements, the face looked immediately better and you have more hair type and color options; though Shepard looked more than a little out of place compared to the more detailed Captain/Councillor Anderson. (More so if you give him/her blue hair.) Nevertheless I imagine I'll spend quite a bit of time tweaking my face in the demo until I get it perfect.
Because my PC isn't powerful enough for even ME2, and I no longer own an Xbox, I'll have to hold off on playing ME3 for a while until my friends are done with theirs and willing to let me borrow them and a 360.
btw... i don't really like the new ashley, she got a strange face... in ME1 was better
I remember saying this when they revealed her earlier. I believe it's the long "femme fatale" hairstyle they gave her in combination with the heavy (for Ashely) make-up. She's really sexed-up this time, which is just at odds with her bad-ass tomboy-soldier character.