I actually did like the concept of going through WoW's version of the after life. It was very poorly executed but it was a cool idea, at least imo.
I thought Nathria was as good raid.
I guess that's really about it. I didn't care for the covenant system, the themes of the zones were cool but the layout of the zones seemed kind of bad, the story was the worst in WoW's history, Torghast is tied with Visions of N'Zoth for being the worst content ever put into the game, juggling all the currencies was a pain, and the Maw is torture in video game form and easily my least favorite part of the xpac. It's probably the 2nd worst xpac next to WoD.