I disagree with almost everything you wrote. Since you haven't actually played the content, how can you be sure anything you wrote is actually true and not based on the hyperbolic blathering of some anti-blizzard complainers? You don't because you haven't played it yourself.
The AP grind is not infinite. In fact it is over. I have 2 specs to 52 and my third spec at 50. I'll have it at 52 after another week of raiding/WQs and mythic + dungeons.
Zones are easy to get around in. Flight whistles (do you even know about them?) and fast flight paths make getting around easy. Of course now there is flying.
The raids are great, mythic + are a constant challenge and can reward great gear. My professions are quite useful. I make tons of money off of enchanting and Tailoring.
Yes the legendary system sucked ass. Yup, Warlocks lost a lot of class identity and each had some major design issues. Still enjoyed the game and it didn't prevent me or my guild from raid progression.
Your missing out, but that's your call. The joke is that you are here complaining while completely ignorant of the very thing you are ranting about.