Typically, MMO designers give melee DPS around a 10% buff to DPS output over other classes, because it is assumed that they will not have 100% up time. They are melee, which usually means that they have more mechanics to worry about that will keep them from being in melee range.

That being said, the current FCoB mechanics do not follow this path. They are all very melee friendly, which has lead to the gap between the DPS classes being very VERY noticeable. It is easy to spot this occurring because most FCoB raid compositions are 2 melee DPS, 1 BRD, 1 BLM. In past coils, this was much better balanced.

FCoB has been called the melee DPS coil because of these changes, and if a caster was not required for most of the fights, 3 melee 1 BRD compositions would be all over the place.