Literally days away from launch at this point and we already have "worst expansion ever" comments. Honestly if you go into anything wanting to dislike it chances are you most likely will.
Personally the best option (at least for me) is to take each expansion as a clean slate and not base it on past ones. I mean there are multitudes of other games that have good/bad versions of themselves.
I for one can't remember the last time i was this hyped for an expansion, I've not had genuine excitement since the wotlk expansion reveal. At least on a personal level, not saying cata/mop etc were bad
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Genuinely hope it is as good as i feel it will be. We all know we are due a winner.