So I finally had to see, since I hadn't watched any of the show yet but keep hearing about how bad it was. I watched a couple of the scenes in the third episode (it took that long to have an attempt at a real set-piece?), and they are indeed laughably bad.

A couple of thoughts. Despite my background, I don't necessarily look for realism in fight scenes--watching someone who actually knows what they're doing is kind of boring, since making it look cool also means making it less efficient and less effective. Plus, I train something real. I don't mind watching something crazy if it looks cool! So my issue is less with some of the things you mention, simply because it's fantasy or whatever and I don't care.

But yeah, with Iron Fist it's clear they didn't work at it very hard, and I think that's a bigger issue. I watched one fight scene towards the end of episode 3 where a character is in a cage match of some kind (I was just skipping through trying to find one). It doesn't look choreographed, it looks staged. The opponent literally grabs his own fist before striking, a classic "I'm punching with this hand" move. The character fighting him, who was much smaller, gets a ridiculous amount of leverage in a couple of places (requiring some suspicious editing). But the filming seems bad too...the director doesn't seem to have a good sense of space the way some others do.

To your list of good choreography, I'd add Crouching Tiger, Hidden Dragon and The Raid.