Disappointed the Warden was killed, as I thought he was a great character. And Tobias killing Schillinger was a nice twist. Such a fantastic cast of characters and to maintain that over 6 seasons and 56 episodes isn't easy, so every credit must go to the writers. Terrific cast, terrific acting, some fantastic scenes, plots, storylines and twists. Can't really ask much more from a TV Series.
Though the ending did leave me thinking it could always be brought back, though I suppose that if often the best way to leave a TV Show.