Just saw the first two episodes. So far it is fine. Flaws are there slow pacing, etc. Don't get all the critic hate though. They seem to forget Daredevil was slow as fuck in the first few episodes.
I don't think DD was all that slow to start. The Kingpin conflict was a slow boil, sure, but the second episode of the first series is arguably the best in either series and hooked a lot of people in early. I don't think there is anything that even begins to compare to "Cut Man" in IF, certainly not in the opening half of the series.
More importantly, the quality of the script and the acting was blatantly obvious from the very first pre-credits scene in DD. In terms of actor delivery, the confessional scene completely shits over anything in all 13 episodes of Iron Fist quite frankly, none of the IF cast get anywhere near the level of intensity that Cox delivers. The writing/dialogue is at best okay, at times outright bad in IF whereas from the first episode in DD the dialogue was good, the characters had chemistry (Foggy took a while to grow on some to be fair).
So whilst I wouldn't say DD was exactly a lightning quick pace at the start, it was a much, much stronger opening few episodes than anything that has followed since in a Marvel product (apart from maybe DD season 2 which started stronger than it finished), especially IF.