For me it kind of goes: DD - JJ - IF - LC.
I felt like season 1 of DD was perfect, season 2 was perfect for the first half but uneven in the second (not bad but had some issues). JJ was great but also went a bit wobbly after the halfway point, almost felt like they had to insert a few episodes of filler to make the full run or something. Iron Fist I liked more than I thought I would. Luke Cage wasn't bad but just didn't really grab me, it was also strong in the first half but went off the rails a bit in the second.
Overall they're all between pretty good and great for me.