The last time I got into an AV vs some multiboxers guys ended up being a victory for the alliance because we
actually put effort into thinking outside the box rather than throwing ourselves at them constantly hoping that would do anything.
My only real complaint is that it lasted over an hour and it was quite tiring to be focusing that long.
However, when it comes to two multiboxers... that's basically impossible but in their defence it doesn't happen nearly enough to me for it to become a huge frustration. It actually looks quite fun on their end and I see why they do it.
P.S. This is coming from someone who used to bash multiboxers to no end.