I think the show throwing it's more fantastical elements at you, with no real explanation is a bit of a problem. I like the universe of the show, but the truth is, they haven't really developed it all that well. You're just supposed to accept everything.
Anyways, decent season. In the grand scheme of things, I don't think much happened though. Seemed like one big stall to get to Angelville arc. Still a fun ride, and I think they have done The Grail story line justice so far. Herr Starr was the savior of this season.
One thing I really hope for next season though, is that they put Seth Rogan on a leash, and tone down his brand of humor. Mainly the bro dude dialogue in certain scenes. It's completely out of place, and takes you right out of the show. Jesus using modern lingo, was cringe inducing. The Hell river guy, just talking normal and cracking wise was stupid as well. Now that I think of it, I don't think it was too prevalent, but when that type of humor and dialogue would pop up out of nowhere, it stuck out so much. The show has some naturally funny stuff, and treating certain scenes like an SNL skit, is not needed. It just makes a mockery of the show.
Show holds steady at a 7/10.
I think they're going to really need to knock it out the park next season, if they hope for a fourth one though. I hope they have a "cancellation" ending in mind, just in case, because I don't know if AMC will renew it, if ratings don't pick up.