I don't have much to say about this show. As a casual viewer, I thought what I watched was entertaining.
As someone who read the original comics, I think this adaptation pales in comparison. It departs quite far from the source material without justifying it or leading to anything interesting, just silly mayhem.
The writer of the comics, Garth Ennis also wrote The Boys, and while that adaption show has also departed from the comic's source material, it is fantastic in it's own right. I mention the boys as an example of an adaptation does not need to be strictly loyal to the source material to be great.
Preacher the show just wasn't great. The comics are amazing though and I highly recommend them, would not recommend the show.