The Bendy Bus is a thing of controversy: opponents claim that it is responsible for causing many accidents with pedestrians and cyclists. They also claim that it is liable to burst into flames at any time, making it a death trap and the three doors make fare dodging very easy.
My argument against these busses is that they take too much space: double deckers can move as many people with half the street size taken up, that is very handy in a busy city.