The first two seasons weren't brilliant, but they were entertaining and made a kind of sense. I've yet to see a season three episode that I liked, whereas I can think of three episodes from the previous season that I'd happily watch again. And I can do that without trying.
It's hard to believe a series I was enjoying (admittedly, it was as a way to shut my brain down) has turned a corner so sharply that I'm about to stop watching. All this in six episodes. The stories have been silly to a level that makes them difficult to get into, with secret missions, drawn out dogfights as time fillers, and characters behaving in a way that makes no sense.
I'm a pretty patient guy. It takes a lot to stop me caring. But they are managing just that.