I use BP3, and I noticed that if I use it against a persistently strong enemy, when I manage to kill one side of the shields, that side doesn't regenerate. Or, it stops shooting for the duration, or stops using special abilities.
In about 50% of the occasions, though, it does no appreciable effect.
And when using BP3 against "normal" enemies, those ships usually blow up before the shuttles even have a chance to board them.
So, if you ask me, I'd say that it's useful in about 25-33% of the situations and useless in the remaining 75-67%.
Of course, I'm talking about PvE. I don't PvP, but I guess that a human player will prioritze targetting the incoming shuttles to avoid the subsystem damage. And still, some heals will negate BP after it lands.
on the contrary, they are quite useful in both PvE and PvP. In PvP though I usually launch the shuttles point blank, with a stick of mines or scorpions for cover. that increases the chance that at least one shuttle makes it through the inevitable FAW/CSV/TS screen. Sure this doesn't always work against hardcore PvPers, but it's not bad against less experienced ones.
The only effective way I've used it in pvp is mainly 1v1 on my Orion Marauder. I'd fly past the target while hitting warp plasma 3, boarding party 2, and release my interceptors all at once. I'm also dropping plasma mines to help the proton mines the interceptors drop. It's a nice little combo, works well in PvE as well. Less effective in group pvp of course.
Who you just blew up with the ship they were boarding.
I like BP3 in conjunction with warp plasma on my engineer's Galaxy-R. In PVE it's a pretty good combo to cripple an enemy. I'm just slightly bothered that I regularly destroy ships with a boarding party still on them.
I programmed my ship's replicators to produce simple combat androids. They're cheap, efficient, and disposable.