Yeah, compare naxx 80 with naxx 60 and talk about retailers. Compare mythic kj, avatar sasszine, argus, aggramar, coven, guldan, helya, archimonde and so on with naxx bosses.. Some of them probably have more mechanics than whole naxx had. Maybe you died also rather easily but you got 1/2 buttons or some kind of heal it + your omen bar to watch.