I'm talking about the usual "Big Bad shows up for the first few episodes, goes off the grid even though it should be physically impossible for it to do so, shows up mid-season, disappears again, and returns during the last 2-3 episodes for a big finale". Jack could have been kept around in the bunker, training his powers. No need to make every episode about him, just give him something to do instead of having the Winchesters calling up hunters (again) that find nothing (again) even though Jack is an inexperienced Nephilim whose power is so great, a Prophet who'd met God thought he WAS God. He doesn't know how to suppress his power any more than he knows how to control it, and yet we're supposed to believe he can just hide?
I like this series, but this is getting boring/annoying.