Hey there. SL/SL lock here wondering why the blueberry is never mentioned as a viable pet for BG's.
Ok, before you start droppin' noob bombs on me, follow this scenario I tried in WS the other day:
Sac voidwalker and make a new pet just outside ally flag room. Pet comes with 10% less physical damage adding to the already decent damage mitigation you get from the SL/SL spec, plus running in with an extra 3700 hps from the shield, get beat down a sec while dropping a howl of terror (without the interruptions), start SL on a few as they're running away, pick out a weaker one and drop some bombs. As the start to come back to beat me down again, before I die, sac the new VW, right-click necrosis VW for .5 sec summon on the third one giving me a chance to heal up a bit while continuing to damage the remaining players. As I get low again, sac again, maybe hit my health stone, another howl of terror, make new pet, drain tank remaining two players, get low, sac, continue to drain if there's any mana left and finish them off.
cleared the flag room of about 5 by myself, though I ended up getting some help by a couple of people at the end to finish them off. Would have been close because I was about out of mana and on borrowed time, but it seems to me that there's certainly value in using the VW in BG's but I've never heard of anyone doing it.