After three episodes I'm finding it hard to be drawn in. Nice characters, but all too easy to sympathise with. It's in danger of being a soap more than a superhero story.
Jessica Jones might be more up your street then, if you've not already seen it?
Looking at the three series (Daredevil, Jessica Jones, Luke Cage), I think Cage is possibly the most straightforward superhero narrative, and I do wonder if some of that is about the setting and majority minority casting, which, sadly, may have seemed risky to the commissioning executives. (Although it could be a fair representation of the character in the Marvel canon, for all I know).
Parts of it did seem to have something of an edge, to me, (Cage's interactions with the Police during the middle episodes, given events in the US, for example) although that sentiment is mostly actually voiced (if at all) by minor characters afterwards.