Would have to agree with Kyriea here. Watching the first boss literally go down after only 1-2 adds have spawned, as opposed to watching 10 adds spawn before the boss is even down to 25% will sway anyone away from attempting the Wall Boss. The biggest thing for most classes are the weapons. Full AF gear will only get you so far, but if you are still running with level 40 weapons it's time to step it up. Level 45 bare minimum weapon (preferably lvl 50) would help out a great deal, not to mention having the extra cross-class abilities from different classes depending on what your current class/job is.
The wall boss and the last boss are very unforgiving when it comes to people who lack dps. They will kill you, and quite easily if you don't have the appropriate damage output.