I've seen 3 episodes of Luke Cage. One of his friends, as a tease, calls him "Power Man" from time to time as a little friendly tease, which is probably the best way to handle that nod. The reference is obvious but it's not drawing attention to it at the same time. Just kind of there and feels natural. I'll reserve judgment of the series until it's done.
Speaking of Super Hero shows, finished Supergirl.
I have to say, it's quite good. I was convinced the show was going to suck based off it's goofy trailer, but the first episode hooked me almost immediately when it basically showed "no, it's nothing like that" and really demonstrated "we get Superman!" In fact, the show feels like it was SUPPOSE to be for Superman, but Warner Bros. didn't want one of their big titans relegated to TV to draw attention away from the BIG BUDGET MOVIES to compete with Marvel, so they compromised with the gender swap, and adapted it well. Yeah, obvious "This is female Superman" things are in there, like having a Male!Lois Lane equivalent in Winn, and a female!Perry White in Kat Grant...I don't know anything about the Supergirl lore I should note.
There's a lot I could say, but honestly I'll just leave it at "it's a show that GETS Superman, and demonstrates it through his cousin." They also sidestepped some issues like early on you worry "oh no, she's going to constantly compare herself to Superman" but by the Reactron Episode, they pretty much end that ark, and they make it clear that Superman is really just an inspiration and frame of reference , rather than beat us over the head with "THIS IS FEMALE SUPERMAN!" They really sell you on "She's her own hero, treat her like one."
But yeah, the big thing is it gets how to do a Superman show. Focus on all the positive aspects of being a hero, and bring in the negatives when absolutely necessary. Don't focus on the tragedy, focus on the hope and heroics, overcoming the odds. Make the hero a POSITIVE, optimistic figure, not a brooding, angsty individual. Really, her speech at the end of Season 1 really comes off as "THIS is what Superman is all about, Zach Snyder, NOT your own fucked up vision of him."
Oh yeah, and the Flash crossover was a lot of fun. Worked well because both heroes are fun and positive figures, and so the chemistry between the two was fun. Even when Barry's like "I'm stuck in another world that I reached completely by accident" his reaction is "well, this is awkward, but might as well make the most of it and help you out."
That said, ranking the "Arrowverse" shows, I'd probably do it like this:
1. Flash: Consistently good and most developed, just hammers "it's fun being a super hero, even with all the baggage!" aspect.
2. Supergirl: A lot like Flash, only FLash has 2 seasons to develop vs. Supergirl's 1, so call that a tie break for Flash.
3. Arrow when it's Good: When Arrow is good, it's really good! It's not as "Fun" as Flash, but it's good
4. Legends of Tomorrow: When all is said and done, it's fluff. Fun fluff, but fluff. Can only give the series so much credit.
5. Arrow when it's bad: I have to separate this from Arrow when it's good because the two feel like completely different shows. Arrow is PAINFUL when it's bad. This is emphasized best in Season 4, where when it focuses on Damien Darcc? It's really good and fun...oh wait, OliCity kicked in, STOP PLEASE GO AWAY NO I WANT TO WATCH SOMETHING ELSE