Ranged LBs are very odd, and I definitely feel should be reworked.
They have a tiny length and width. Using them successfully essentially ensures you will die after casting it (because of the animation delay).
The damage, for an AOE LB is very underwhelming considering the area of effect is smaller than Caster's and does less damage.
It doesn't work on characters of a different elevation which happens very often, again unlike the Caster LB which is probably just superior in every way.

Healer LBs I see very rarely. It's kind of sad really, I am not sure why this is the case, probably because it has a cast time. Perhaps again the cast time for this ability should be removed so that healers actually get to use it.

Caster LBs I am sure many a front-liner has been slept and bombarded with 2-3 of these at the same time. A skill like this existing really does amplify the affect of a coordinated team (which is good, but still feels kind of broken)