I think I'm about the only Marvel fan that didn't like Jessica Jones all that much.
I'd say:
Luke Cage
Daredevil I
Daredevil II
Jessica Jones
All have been somewhat uneven. The beginning half of Luke Cage was definitely better than the latter half. Daredevil II dragged when Punisher or Fisk wasn't on screen, but that season had incredible highs.
I haven't had time to watch Iron Fist yet, but the criticism that they cast a white character with a white actor doesn't concern me at all.
It was driving me nuts when people were saying Marvel was being racist and white washing the casting. He's white in the comics, he's been that way since the 70's. It was during the Kung-Fu phase of pop culture.
If you really think about it, casting an Asian would have been more racist for some one who is a master of Fung-Fu than "white washing" the casting.
To me, Cage felt up and down felt like there did a lot of fillers in it. Jessica Jones was the same way, too slow at times, but love Tennant as Purple man. Didn't know how I'd feel about him playing the baddy after Doctor Who, but man he's good. Actually wanted him to voice Rocket in Guardians before Cooper got the gig.
They all have been good. DD has been the best, but he's the big character and I'm sure more goes into that show. Finally got a good Punisher. I like Iron Fist a lot, wish the fight scenes were a bit better, but it's harder to use a stunt double when you don't cover his face like they can in DD.
I can't wait for the Defenders, I'm hoping it's this fall and then have Punisher next spring. This way they can start staggering shows in fall and spring.