Some people struggle for hours, spending effort and time introspecting and exploring their feelings. You could do that, I guess. Or you could watch this guide by Simply Impressive about How You Should Feel About WoW.
With the appropriate shout-out to BC and previous expansions, Slightly Impressive does a good job of creating a bullet point list of usual sentiment. It’s somewhat a shame that the official forum is so predictable, but once you’ve been through the cycle a few times… you probably know what complaints are coming.