Ive done them all on live now, and I've got to say that this is the most epic feeling raid since Ulduar. For me, it was necessary to show the maelstrom and dragonblight, as that fits the lore perfectly. The fights are fairly clever too. Plus you dont need 14 bosses anymore, especially now that there are hardmodes. If you want deeper progression than 8 bosses, do hardmodes. If you are the kind of person that kills 8 hardmodes quickly, you should be used to that by now. If not, you can have fun in hardmodes for a while.