Action scenes were bad? You going to have to back that one up.
I'll spoiler it to be sure.
Obvious misses, soft punches and kicks going around in nearly every fistfight scene. Heavy objects that were picked up suddenly looking not heavy anymore. If someone threw or punched another person so that he went flying you could see that it was fake too much. Especially the scene where Diamondback falls from the balcony in the theatre comes to mind, clearly someone had thrown a dummy.
Maybe I'm being too harsh but I really feel that the effects in Luke Cage have been the worst of the Marvel Netflix shows so far.
edit: Have to add it didn't really influence my opinion on the show overall, all the good stuff surely outdid the bad.