I've got round to watching a few episodes of Iron Fist now. So far, I like it. Certainly doesn't deserve the mauling it's been getting.
On the fight scenes, the problem lies in that he's meant to be so good, no one is a challenge (as far as I've watched). So the fights are short and conclusive. Somewhat like the climatic scene in Crouching Tiger where Li Mu Bai faces off with Jen Yu, and there's no contest.