Well the 360 version is better graphics(not by too much) and better draw distance. Outside of that theres no glaring differences which means the ratings for the 360 version is obviously low since the graphics and mechanics are on the low end compared to other 360 games. This game did come out 2002 ish after all..

I have not played enough WoW to actually comment on it (go lvl 4 Druid! LOL) outside that FFXI seems more oldschool, more bread and butter-ish and needs more patience with a love for grouping, while WoW at the moment (lol lvl 4 again) seems a bit more fast paced with the way its setup and easier interface to use once you get used to. WoW also seems heavily Quest related, however most of the ones i did were kill soso monsters or fetch soso items; not that FFXI doesnt have any of those either though but it doesnt seem to stand out as much to me.