It seems that everyone in this thread somewhat agree that the current LB3 is either so weak, or so situational, as to be currently useless. The answer seems to be to buff the LB3 to be closer to the PVP raise ability or to completely scrap it altogether and introduce something new and more useful.

If you want to look at it this way - it is seldom used by anyone because the rest of the team usually keeps limit breaks for other types (eg caster). Surely the best way to balance the jobs would be to introduce a limit break that could be of more use in more situations.