I only watched I think two episodes, it was sadly really boring, outside of Matt Ryan being really good as Constantine, just pitch perfect casting. The good news is they folded him into the Arrowverse and he got to reprise the role as a guest star on Arrow, and the later on as a regular on Legends of Tomorrow. Plus voiced him in a few DC animated features.

One funny side effect of him moving from NBC to the CW, is the CW had a rule about smoking, namely that you couldn't show it. This was a slight issue given Constantine is an iconic chain smoker. So they got around it by simply not having him visibly smoke on camera. They could show him WITH a cigarette and his zippo lighter, even about to light it, and either having him interrupted or cutting to another scene, or having obviously just finished one and is stubbing it out on the ground. Later on they had him cut back on his smoking in-universe after a brush with lung cancer, but he'd still have a pack he'd pull one out of now and then.

Silly, but gotta dodge round those corporate mandates.