What I found wrong with WoW was there is a VERY lacking sense of accomplishment in that game compared to FFXI up until Abyssea.

I also dislike how they pretty much killed off the social aspects of the game by making it solo heavy in the part that matters of an MMO which because WoW got popular and sparked interest in the mainstream crowd in the west, became the "standard" for MMOs to follow, thus basically killing off what MUD/MMOs used to be about.