Iron Fist takes a long time to say very little.
There are arguments to be made that series like Jessica Jones and Luke Cage were somewhat over extended. Jessica Jones had an incredibly frustrating tendency to have Jessica capture Kilgrave, only for him to escape and prolong the series; AKA The Sandwich Saved Me, AKA Sin Bin and AKA 1,000 Cuts all played the same card. Luke Cage fell apart in its second half, taking its protagonist out of action for several episodes while essentially repeating itself over the final four episodes, with Luke going from fugitive to hero to fugitive to hero.
However, Iron Fist is particularly notable for placing this drag at the very start of the season. The first four episodes of Iron Fist can effectively be written off, accomplishing very little in terms of moving the plot forward and establishing a series of obstacles that are handily dispatched and which fail to either move the plot forward or provide keen insight into the characters. Luke Cage might have opened slowly with Moment of Truth and Code of the Streets, but at least it provided a sense of character and place. Jessica Jones built up its sense characters.
In contrast, the driving plot of Iron Fist only comes into focus at the end of Eight Diagram Dragon Palm. Which makes the preceding four episodes seem like a waste of time and energy.