As long as legion has good questing it could be ok. WOD/MOP and Cata was the most boring questing I have ever seen, especially WOD/MOP, so on-rails, and acrcade games? Shoot down the airship or whatever. It's so mindlessly boring. Compared to going back to mulgore before the utter butchering of Azeroth, in classic realms. That's when questing was good.
If Legion is like vanilla, we will all see the good game again. 3-24hour long Alterca Valley? BlackRock Mountain mystique and pvp and treasures within. Good dungeons? Haven't seen good dungeons since TBC really. Good raids? When did we last see good raids? TBC and perhaps some of WOTLK. Sort it out Blizzard, Legion could be the death of you!