Source: http://www.joblo.com Preacher Trailer TEASE (HD) AMC, Seth Rogen, Dominic Cooper
I don't know anything about the Preacher character, but I did a little reading and its a relatively unknown persona from DC comics. I will give the show a chance, but I feel these kind of shows have tough competition against Supernatural, which is one of my favorite series.
Constantine wasn't that bad, but never got to go past one season and develop. However, he is set to make an appearance in Arrow.