Don't get me wrong, i loved it. Every second of it, even if my social experience was awful. The game could be played solo enough to progress. And yes i stayed minutes to inspect people with t3 gear too.
I really think the community will destroy it. Between the retail one who likes Legion (Which i am, but i think it's because i don't compare my dick to other players to see if it's bigger, so i can enjoy what wow is, a game.), the one who hates it but still plays it, the one who wants honestly to try vanilla, and the real community, the despicable elitists who speak louder than everyone else. Look at all the forums, the streams, twitter. It's gonna be a cold shower for a lot of people.
Maybe i'm wrong. We'll see.
The vocal vanilla community is the SJW of WoW. Pretending to fight racism and intolerance while being worse.
Maybe it's only my personnal experience but i got way more friends after Cataclysm. Vanilla from Wotlk was extremely elitists and arrogants when the "pleb" managed to reach the same spot. And for PvE... well, it's probably less personnal and more "solo games with people around" but at least i can do it at my level (HM at max) without being rejected because i had the luck of prefering the shadow spec and not being dwarf.
The community is maybe more dumb but way more open on its way.
Tip for Vanilla : play an ud sp with your friend and you will be able to duo all the level 60 dongeon without having to wait 2h for a tank (Warrior.)