I have played. I was most active in WOTLK.
Played on and off from Cata to WOD.
I really like topping meters but then to do so you need to have gear which means you have to be in a guild which means you have to commit to a raiding schedule which means I have to sacrifice rl stuff like tennis/cycling/socializing etc.
So I haven't played Legion yet. If it was a bit cheaper I would give it a try. The importance of legendaries and it being alt friendly are drawbacks though.