So... with 10 luck do you deliver the same criticals (damage, cripple, knock out...) than another built with 1 luck?? I though both sides, attacker and defender, were important
For bursters luck doesn't matter, beacuse there is no aimed shot, it affects only kds for bursters, and that's not so much important than more dmg.
For sniper luck 8 - 10 is must be.
If you do it with 1 luck, you'll have max 16% crit chance, and you'll be easy target for enemy snipers and for a bypass from burster etc.
I recommend taking 5 luck at BG critburster, going for 20% critchance, and no BRD at all, but better crits, or MRD and full hps.