Oh man, you don't know what you're missing. In fact, this forum doesn't know what it's missing. Those shows are like, one of the best ones out there today.
It all started with Legends of tomorrow. I was gonna watch it because it was, well...DC! my favorite place for heroes, Marvel in 2nd.
Then I realized the universe where Legends take place share the same world with Arrow and The Flash, so, I wanted to watch them all in order, but Arrow looked boring to me, but I pushed through and boy, I sure am glad I did. It was the best weeks of my life, I had lot's of episodes to watch, it's one of those tv shows where you go 'k, one more episode' then you end up finishing the season, lol.
I'd recommend it to anybody, not just fans of heroes or DC.