I quite like that you can get on/off from any door since it does make it quicker to load them up.

But as a non-driver and non-cyclist, I still would rather they weren't there. Why? Since they clog up the bus-stops meaning that if your bus arrives behind one (or even two) on occasion, you're faced with the dilemma of whether to walk along to it or not. If you do and the driver doesn't choose to open his doors, then you walk back and depending on how crowded it is, might not get on the bus. If you don't and the driver has opened his doors, he won't then stop at the bus stop once the bendy-bus has moved on. Yes, it happens with regular double-deckers too but it's not quite so bad.

And try crossing roads where bendybuses proliferate. There's a section at Victoria Station where in the mornings, pedestrians really suffer trying to cross the roads since when the bendy buses stop to wait for a gap in the traffic, they completely obliterate the pedestrian crossing. It's not just drivers and cyclists who don't like them.

And when you're on them, there aren't enough seats, many of them are backwards which isn't a pleasant way to travel so they appear even more crowded since so many people have to stand.