Despite my boycotte of all things EA, I finally got to try this out on the PS3 (I didn't pay for it so it counts as acceptable under my EA boycotte terms) and I have to say I enjoyed it. Seriously, kudos to DICE for doing something different and pushing out a very creative and artistic piece.
The visuals really are something else. The ambience, the environments, and the style are all fantastic! The visual appeal of Mirror's Edge really stands out. Sadly, that's all counter-balanced by the between-chapter animated cutscenes which are completely inconsistent with the overall style and design. Not really sure why they didn't go for total in-game cutscenes, they have a few in there already which are clearly waaaaay better than the misplaced animated ones.
The sound design is pretty decent too. The environmental effects are quite well done. The music is very fitting and really adds to the ambience of the environment.
The gameplay is a lot of fun. Takes a bit of getting used to, especially lining up jumps and recognizing when it's a good idea to run and fight another day. It's innovative in ways of getting you to think about your surroundings and using them to your advantage. The 1st person view is very immersive and DICE did a great job setting up the camera motion and bobbing, adding to the illusion of immersion. The combat is a little tricky but you're not bound to it anyway. There are very few instances where you have no choice but to fight your way out; in most cases you can always run.
In terms of story elements, the plot is not particularly original but it's not bad, at least not as bad as some people make it out to be. Throughout the game you get glimpses of the underlying story and the "why" behind where you're going. Although the animated cutscenes are the major storytelling element, which (again) is regrettable. Finally, I don't wanna give away too much, but the ending was abrupt and insignificant. If you wait on the credits a bit you hear a radio news report indicating that Faith and her sister, Kate, are on the run.
So, to summarize:
The Good:
-Great visuals and very creative design.
-Fun, and not your average run-of-the mill gameplay.
-Parkour!! Urban Ninjas!!
The Bad:
-Visuals weren't used to their full potential (cutscenes!!!)
-Short campaign.. 6-7 hours sounds about right.
-Crap ending.