I enjoyed Luke Cage but it was definitely a step below Daredevil and Jessica Jones. I had a few problems, some of them really bugged me, mainly the tone and the villains. If you haven't watched it yet, SPOILERS.
Alright so if we start with the tone, I feel like it was more over the place than Daredevil or Jessica Jones. Those had some comedy in them, but I feel with Luke Cage it surpassed comedy and went into "this is so crazy and silly I can't believe it". One minute you have a serious moment with Luke Cage and Pops basically having the Uncle Ben talk of great powers and great responsibility and doing your best to be a decent human being but then you have Cottonmouth blowing up a Chinese restaurant with a bazooka. I cried from laughing so hard at that scene. Not necessarily the restaurant blowing up, but you have a crimelord who doesn't send one of his thugs, but rather goes out himself, in his regular suit with a bazooka. It felt so out of place among some of the more serious dramatic scenes.
As far as villains go, they really dropped the ball. I think Cottonmouth was promising,but he left the picture before he got really interesting, and even him at his most interesting just felt like a less interesting Kingpin. Shades was really annoying and had that "I want to punch his face in" quality, but when things couldn't get worse, we get Diamondback. The whole backstory of him being the brother of Luke Cage was so uninteresting and I don't know whether it was the actor or the directing but any time he was on screen, I just wanted to fast forward. It reached a boiling point when he showed up in full Power Rangers costume to fight Luke Cage. Compared to Daredevil and Jessica Jones which had these really great villains like Kilgrave, Punisher and Kingpin, the ones in Luke Cage just fell really flat.
Also, how many times did Misty say "Luke Cage is innocent"?
Anyhow I liked the show but it did start to drag towards the end, and the final episodes became a chore to get through mostly because of Diamondback.