Nor had I and I loved it. A rudimentary awareness of the DC universe may help as Cyborg talks about joining the Justice League and there's the occasional reference to "heroes". But basically you can go in cold and lose nothing. As Polyboros2 said, it's very self-contained.
Swamp Thing, by any chance? You could always get DC universe for a one month subscription and just binge the whole of Season 1 in high quality. It's honestly worth it. Based on how in accord you and I are over in the Harley Quinn thread, I'll venture to say you'll love it as much as I do. Also, in regards to being burned Season 1 is very rewarding as an arc in and of itself. Even if there had been no Season 2 it would still have been enormously satisfying.
I'm 100% serious about the spoilers, though. You totally don't want to know what's around this show's many corners.