Melee LB2 locks the melee in place for five-6 seconds unavoidably, as well as another second for the lock at the end. It is most definitely a dps loss depending on the melee, particularly if it's a MNK, DRG, or SAM. The only one that doesn't suffer a loss is NIN, and even then I'd prefer the ranged to do it.

I still refuse to touch non LB3.