Well, W. Earl Brown, who plays Sheriff Root thinks:

From a speculation and investing standpoint, if you plan on purchasing Preacher #1 you might want to do so before SXSW. If the pilot is as good as most are anticipating this series could be huge. We have no delusions of grandeur that it will be as popular as The Walking Dead but remember that Preacher had three times the following of The Walking Dead from a purely comic book fan audience.

There will be millions watching when it premieres, now we just have to wait and see how good it is.