there is nothing wrong with backdooring, but like
dakkon_blackblade said it's not a very glorious way to win.
but I'm just curious, which of the following do you think defines
backdooring?
1) destroying buildings without creeps
2) destroying buildings when there are still enemy creeps in that
lane. (eg. if i cleared all the creeps in the middle lane, and i
rush to attack the base before my creeps arrive, is that
backdooring?)
3) destroying the buildings of another lane while your in their
base. (sounds stupid, but people have actually shouted out
"BACKDOORER" when i went to attack the top lane buildings after we
pushed the middle down)
4) others. (please state)
can't stand these stupid idiots who never look carefully and accuse
me of backdooring. once all the enemy heroes were pushing the mid,
while my entire team was defending except me. instead I was pushing
the bottom lane, and by the time they pushed down the middle they
realized that during their absence, i destroyed both their middle
and bottom barracks, and they kept calling me a backdoorer,
although i pushed the entire bottom lane together with my
creeps.
another time, my creeps were fighting at the river, and i was
between the river and their base. so i decided to clear the next 2
spawns solo while waiting for my creeps to catch up with me. just
before i hit the first building, the creeps arrived at the base,
but the stupid host kept calling me a backdoorer.
shitheads who blame others just because of their incompetency to
defend their base.