Hhhmmm, contentious. There are rims I'd rather have, but the A23s on my factory Powertap wheels have behaved themselves perfectly well. Definitely not the worst rims that I've ever used.
I also had them on a factory Powertap too and the combo was a disaster which is why Powertap dumped them ASAP. Noodly flexy rubbish unless you are climber build. For a 32 spoke rim they are shocking.
A23 are genuinely the worst rim ever