Tbh, I have to ignore the arseface stuff in Preacher for just that reason lol. I can handle the stuff with Starr because at least it falls into the story overall. But arseface is a total joke side character that doesn't fit.
I also agree that if he even dialed it back a few notches instead of always wanting to crank it to 11, he'd have a way better rep as a writer. He's obviously got the chops to navigate plot, dialogue, continuity, all the details of craft that the greats have. But the need to always paint with a big brush muddies all of that.
And I'm a fan. I've read almost everything he's been involved in. But I'm still right with you on the underlying points you make.