I'd stick to AV as much as possible, once you have your marks that is ofc. Sadly until then it will be difficult to avoid the harassment. It typically only happens in EoTS and AB. not that I'm high enough yet to play them but I have witnessed it first hand. Unfortunately AB is nigh impossible unless you leave the rest of the team to defend points and you are the only person attacking (can be done). or for EoTS you rush in before the enemy have time to cap their own towers and take your team on the offensive.

WSG and AV are much more Multibox friendly in my mind. AV simply for the fact you can become a killing powerhouse (shamans = canon battery) in defence and offence. and in WSG, well.. you become the ultimate bodyguard to any flag runner. Just get your flag runner to run closer to the enemies so that you can take them out without abandoning your own.

Typically what is a lot more effective in my mind, is to grab 5 ppl from your realm and do WSG, EoTS and AB (10 for those) lay out the tactics and have fun mincing the opposition. If it works, you gain alot of support on your realm at the same time, as ppl will love BGs when they get to go with you. make sure you do it with your friends first to find out what works well

hope your luck turns a little