Constantine: The Series
I didn't hate this movie but it isn't one of my favorites. The main reason why I tolerated it was because it was more of a "mythical" story line (it came from the DC comic realm).
I'm not sure if they could make a series using the same storyline and make it good. So many shows today are ridiculous (see Agents of Shield) or (Falling Skies) for examples.
I just can't see a half hour show and if they don't make it an hour long it will totally fail after the first season. Either way, the subject matter might keep it afloat for more than four seasons.