I don't understand either! I've played WoW for years, from hardcore life turned me into a casual player, and seriously, I CANNOT UNDERSTAND HOW PPL COMPLAINT ABOUT THIS GAME!
If you think about EVERY complaint haters point in swtor, WoW still have them, AFTER 7 YEARS!!!!
gamebreaking bugs? experiencied much more on WoW.
Class disbalance? Don't even need to explain why: WoW is A LOT WORSE.
Server disbalance? there's not even a single server on WoW that is 50/50.
Empty server? please...WoW has a LOT of ghost servers, you don't even need to look harder to find it.
I'm not saying this game is perfect, it needs a lot of work, but at least we can notice Bioware is doing a excelent work on that.
I just hate haters...