I... Don't know much about comics. Iron Fist is a white dude who gets to learn the Asian ways. What's so bad about that?
According to our comic expert Slayven, alot of us are used in a supporting way in comics. We have some heroes right now that are front and center. Largely, the new Hulk and Ms. Marvel.
Hiro Nakamura was pretty badass.
Sadly, we don't have huge Asian comic book heroes
Let's also not forget what happened with a black Firestorm, eesh (the backlash not the actual casting).
Would I have been happier if Iron Fist was Asian? Yes, and there's nothing wrong with sticking to your source material. But.... It would have been a prime candidate to cast an Asian actor and change things up. It would have been the closest we can get to an Asian hero because we know we won't be getting a live-action Asian Hulk anytime soon. Still disappointed to say the least.