I liked the series generally and didn't find that the early episodes were slow at all. I didn't watch Iron Fist or Jessica Jones, so maybe it was that the intro wasn't a duplicate for me?
Generally I liked the moments where the heroes were all together and having some personal interactions. I really liked the Luke Cage/Iron Fist bits.
I know they're working on heroes in the early days of their crime fighting, but man is Danny ever a dumbass. What's the one thing that the Iron Fist can do that nobody else can? What's the one thing you shouldn't do near the ancient warded wall? The rest of the team was right to tie him up, but the character shouldn't have put them in that place to begin with. Did they teach him nothing of wisdom or restraint in Kun Lun?
I'm also a little concerned about Danny's level of kung fu. Daredevil was kicking his ass and that shouldn't happen. Perhaps they might be a good match, but Danny shouldn't be losing flat out. Then again, against mooks, sometimes they go down in one punch and sometimes they pop back up. I would like more consistency.
The ending was too dark to see what was going on. Needed more light so we could see the action better.
I liked all the extras showing up and getting little moments in the limelight. It was nice continuity from the other series'.