The first statement is wrong, since you can run instances throughout the leveling process in WoW, and most have a great story behind them, and quests to lead you into them. Like FFXI, you need to consciously choose to do them, which I could see as being a problem for some people that lack the cognitive function to actually do something that requires effort when it's not thrust upon them.
in ffxi you must do mission 1 to 5 ( start from level 20-25 )
but in wow = huh? all normal quest = waste of time ( only for exp )
and if you want to enter to sky, sea
you need to to zilart and CoP ( great story)
but WoW as long as you have great armor you can go to anywhere
( and here i was thinking if I need to do some quest to go to outland or north (
and true to be told
most of time I find myself doing ignoring the quest log
( I enjoy ffxi c/s story more than wow quest log )
just 3 boss?
you know ....there alot of them
most north instances have boss like that ( most is not all )