The problem with TV second seasons

Okay, the first season was great, there was a teaser to get you to watch the second season.... then you tune in.....
It could go either way.
First there's disappointment. Exhibit 1. (as Rod Serling used to say) "Bates Motel"
It was a flimsy idea to start with, but the charisma of Vera Farmiga and Freddie Highmore must have convinced producers. It seems this show is treading water. Where is it going? We know what happens to Norman, but the journey is no fun anymore.
Exhibit 2 "The News Room"

Then there's surprise:
"Hannibal" Struggling with the ratings, many thought it wouldn't return. The quality and style of this show has always been consistent. This new season is compelling and, if anything, richer than last year. This is a prequel that works, unlike Season 2 of "Bates Motel".
Season 2 of "Orphan Black" is better than the first season, fleshed out characters and more complicated setups.

Jury's out:
"Banshee"
"Da Vinci's Demons"
(Even though both have been given a third season.)
BBC3's "In The Flesh" (3 extra episodes in this series, was it a good idea?)