I think Marvel have it pretty tough and are held to a higher standard.
Coming from the movies, which are pretty much excellent, I believe there was a higher expectation for the TV shows. Increased budgets, access to better writers and actors, and a big investment for Netflix - one of those sets of shows that will make the company a global player in original content. I think everyone thought this was an opportunity to deliver something new, exciting, something that would compete with the very best TV ever offered.
Except TV is hard. Most shows are terrible and don't get past a first season. It's a special magic that hasn't been figured out - not in the same way that most blockbusters seem to have a formula that works for them and there's fewer slops than before. It's clear TV is super heavily influenced by the showrunner - the difference between Daredevil seasons 1 & 2 are stark. Other poor decisions like the often quoted 'too many episodes' or 'poor special effects' have really hurt the brand. And yet most shows have those same issues. Breaking Bad had a few clunker episodes. Game of Thrones has occasional obvious budget restraining scenes. And first seasons are typically the worst of a TV series, everyone figuring out how to make the property sing. Even the current superhero TV series are mostly campy rubbish that we just accept because our standards are lower.
Netflix got what they wanted from the Marvel deal (subscribers) but will be bothered now that they'll not see the long term benefits (keeping subscribers). They have to compete with the very best - they can't get away with being just like normal TV. Same way Starz, Showtime and HBO can't get away with it. If you want to compete with your own pricing model you have to be better than everyone else. It's not fair but it's what it is. This I think is a lesson most indie comics don't understand.
Iron Fist is probably just ok. But given our expectations that's a disaster for Marvel & Netflix. And their bed is made, there's no way to save these shows as the audience is lost and won't return - like what happened with Agents of Shield.
It's a tough business if you have to deliver the highest quality just to play. But that's where Marvel put themselves.