Constantine is the best thing currently on television, in my opinion. It's a show about a human doing bogus metaphysics and not a metahuman doing bogus physics, which makes it different from Flash. It's true to the source material (making it different from both Arrow and Gotham) without being a slave to it (making it worth watching instead of just reading).
Matt Ryan and Angelica Celaya's on-screen chemistry is exquisite, sexual tension real but not overpowering. Special effects whose corniness is justified by the circumstances, and to my mind the most important bit: real, human stories.
Amidst the occult, the psychic, the voodoo and the demonic, the show is about redemption, worldview, escaping, and struggling with "inner demons." Constantine is entertaining, but more than giving you something to care about, it gives you something to relate to. And as far as I'm concerned, there's room for humans to do business in a TV world bigger than sit-coms.
