But those other games offer you something else while leveling as well.
Of the top of my head: BDO, tera and BNS offer imo the 3 best combat systems, SWTOR has amazing storytelling with amazing RP possibilities, Aion had amazing visuals, etc.
Please stop comparing current wow to vanilla (which is garbage compared to any mmo in the past 6+ years) or old mmo's of old, those are either dead or populated exclusively by bots and nostalgic people. I too still play WC3 and silkroad online from time to time but not because they are objectively good games by today's standarts but because i grew up with them.