The CW has created the Arrowverse with the the DC Comics based shows "Arrow," "The Flash," "Supergirl," and "Legends of Tomorrow." Over the summer I decided to start watching "The Flash" and little did I know that once I started watching that show, I would get roped in to watching all of the shows that are a part of the 'Arrowverse.'
Once I finished "The Flash" I knew that I had to watch all of the others to really understand what is going on. This lead to a lot of commitment and I still haven't finished all of them yet! I have successfully watched "The Flash," "Arrow," and "Supergirl," but I am still working on "Legends of Tomorrow." Even though this has meant a lot of commitment to TV (more than I'd like to admit, it has been so worth it.
The CW has done a great job of creating very different worlds on each show that still come together so well for the giant yearly crossover. If you've ever seen "Arrow" you know that the show goes for a much darker vibe than "The Flash," and "Supergirl." Although, each show complements one another so well that when it comes time for the crossover sometimes you will forget that you are watching different shows.
All of these shows also give us tons of characters to fall in love with, and sometimes get a little mad at (I'm talking about you Oliver Queen). The actors all put so much work into portraying their characters well, because they know that before these shows even existed people loved these superheroes from the comics. With that being said, I imagine that it was not a easy thing to step into the role of an already loved superhero and make your own way with it, but each of them has done so well. (I mean casting Tyler Hoechlin as Superman? An incredible idea).
The CW has created a whole new universe for fans to fall in love with and they have done a great job with it. The 'Arrowverse' is changing the way linked TV shows are being done and they are doing an incredible job, while maintaining great story lines and introducing new characters (I'm talking about you Batwoman). If you haven't already watched all of these shows, I recommend you get started as soon as possible.