Well, the two main reasons have to be the creative team behind Preacher . Almost an entire issue is taken up with a girls' night out featuring Tulip and an old friend. A large proportion of another one comprises Jesse, Tulip and Cassidy sitting round a diner table discussing the enormity of their task, and the sheer impossibility of punishing God. And best of all, at one point the story stops dead for around five pages or so to allow Jesse to pay tribute to the late great comic Bill Hicks. This is basically because Dillon's art is so good as to be virtually invisible.
Most comics have at least a couple of pages where the artist can cut loose and show off a bit.
Preacher is notable for rarely doing that. Dillon's artistry is entirely dedicated to getting the story across in the clearest form possible, and his tremendous control of facial expression and framing means that even issues that consist almost entirely of three people talking around a table are a joy to read, giving Ennis' dialogue the setting it deserves. As is generally the case with successful comic series, Hollywood has come sniffing around, and a movie version of Preacher is currently being considered by Rachel Talalay, the director who made a complete Eli Wallachs of the adaptation of Tank Girl a couple of years ago. So as with Transmetropolitan , I'd advise you to go back to the source and check out the original comics, rather than wait for a substandard and inevitably toned-down film version. You'll be rewarded with the best storytelling in comics today, and a whole batch of laughs, thrills, scares and even a couple of philosophical insights.