No comment on the asymmetric design.
But as I just came from an RX-8 I would say the access is similar to a 2 door set-up, if you want the kids to get out pavement side you still need to open the front passenger door.
The rear "suicide" doors just give a wider opening.
The worst place to use them was when you were parked between vehicles as you would box yourself in with the doors open and had to juggle around to shut them again.