The line between classic and retail is drawn at WoD
>squished out original numbers from lvl 1 to 90
>confined everyone in single player zones (garrisons) and this wasn't an optional thing, you had to do them to progress
>Mythic raiding became the norm
>new hd player models
>you as a character become "The chosen one" and no longer part of a large army or faction. You become John Warcraft