With using the wrong LB I was referring to situations where a certain class activates the LB while theirs has no effect on the situation "or" the fact that it often gets activated when the bars are almost full (when they could have been full in a few sec) or activate it just before the boss.
People constantly make descissions that aren't in the best intrest of the party and there lies the problem.

As far as the weak dps LB damage goes, I set the boss HP to % in the options wich is why I express it that way. But you've got to admit that there have been plenty of situations where a DPS sets off an LB with all bars filled and the HP bar of the boss didn't even move.. that gives you an indication of the damage it does. I wouldn't put the LB damage above 1-5% in the best case (in the higher end dungeons), in lower end (beginner bosses) I'd say its about 4-10% on average.
I wouldn't call it epic if the one thing that puts "cooperation" over the edge is the one thing people usualy screw up, and minor dmg isn't epic either btw.