First season: very good, well done, and a great finale. But it should have ended there. Second season: totally unnecessary, boring, and bad. Third season: incredibly dumb, bad in a lot of ways (not the acting, of course, which is great from start to end), and really bad. Fourth season: ABSOLUTELY TERRIBLE. I SHALL REPEAT: IT SHOULD HAVE ENDED AT SEASON ONE. (The rating is just considering the first season, which I recommend you to watch and then stop, not going any further.