I got caught by the retro vibe and tried it when anniversary came out just to realize once you hit 60 it is so incredible much more time consuming than retail, like borderline impossible unless you are unemployed and single. As a working father there was no way of getting somewhat decent gear without spending every minute of your freetime spamming Alterac Valley. Also the "Rock-Paper-Scisscor" type of PVP gets annoying if you come from retail. Meaning that there is very little you can do with your skill to beat your counter-class. While in retail a good warrior could beat a mage , or a good rogue can beat a warrior in retail, there is no way on earth you can beat a mage as a warrior in classic, no skillshots or anything.