OK here are my impressions after finishing the first mission and swinging around the city for a while.
Graphics are pretty damn good, didn't notice tearing or framerate problems yet, the indoor environment that I was in looked great and Spideys character model is amazing.
Combat although not as fluid as Batmans is fun and the animations and finishers he pulls off are awesome. Looks like there are many upgrades that can make the system even better, with the ability to web strike and bounce from enemies ala Web of Shadows.
Sound is good, with all of the combat and swinigng sounds giving a satisfying punch. Voice acting is superb, Sam Riegel is the man as Peter.
Onto locomotion, I have no idea why I was dreading the web swinging, combining swinging with webrush is freaking crazy. No Spider-Man game can be without webrush from now on. All I have to say is don't listen to everyone else's opinions, play it for yourself and judge like that.
Story also seems really interesting, like where they are going with it and hope it can keep up.
Ask me any questions and I'll try and answer to the best of my abilities.