I feel like most of the problems could be solved if the writers had more time to revise the scripts. The plot threads were good, but it could have been streamlined and the dialog was very awful at times, specially Danny's. I don't think Finn is a bad actor, but he's certainly not good enough to make bad line work. A few more weeks to tighten the scripts up would have done wonders.
Another major thing is they need their own style. DD, JJ, ang LC all had their unique style, touches, and inspirations. DD in particular really helped make the fight scenes unique and awesome. Iron Fist was just generic and uninteresting. While I don't think the fight choreography itself was bad, but the way it was shot and edited was bad. For season two they really need to look at great kung fu movies, both old and modern, for inspiration. It needs that style that makes it seem more unique than any other action show. And directors who can do that.