The fight scenes were incredible. Absolutely top notch. I typically hate the Chinese Kung-fu style of fighting in movies because it's so insanely hokey it ruins it (like the live action Mulan remake, or even parts of the new Mortal Kombat). But they were done so well in this. And the CGI I thought was pretty top notch. Crazy what a movie with a huge budget can do.
The story wasn't really all that complicated, and there wasn't much to it. Most of the screen time was filled by the fight scenes, which got kind of long at times.
Overall, it's nice break from the same ol same ol Marvel characters that are getting kind of stale. If you like Marvel, I recommend seeing it.