I just got done watching season 1 the other day as I get ready for the Defenders. It definitely is the weakest show of the bunch. The writing was just down right bad a lot times. It seems like they had no feel for the characters, especially Danny, which as the lead is a pretty bad thing for a series to struggle with. Not sure how I feel about Finn Jones as Danny, I like to give him the benefit of the doubt because I don't think the writing and the directing was there for him, but man he struggled a lot.
I liked Colleen and Ward, probably the best part of the show. Joy and Harold sucked though, which was too bad because I actually liked what I thought those characters were going to be. They should have done more with Joy's friendship with Danny, they hinted there was a bond there, but then it went no where. Harold went a little too ham for me, he became silly instead of a behind the scene's threat. The hand stuff was alright, I thought Bakuto was decent.
All and all I think season 1 was a mess, but I do feel Iron Fist can be saved. I think they definitely need to get rid of Scott Buck as showrunner, and bring in a different team that can learn how to write some compelling and consisting characters. I'm also hoping that the Defenders can start to fix Danny as a character.