1) WotLK=TBC (Lore for WotLK, Raids for TBC, can't really decide)
2) Legion (Loved the Lore in Legion)
3) Vanilla (Not really a fan of the grindfest, I stopped playing after a while, took a loooong time to reach my friends' levels and got bored)
From now on, everything has a huge turn-off for me and are equally bad.
4) Mists of Pandaria (pandas? really?)= Cataclysm (raiding was a crapfest IMO) = Warlords of Draenor (PvP was crap, lore-mess and nothing to do)