The one thing no-one has said is that they followed the Avid recommended set up of advancing the pistons with the pads out (someone earlier did alude to it) using a 1mm spacer card to stop the pistons closing tight.
The R's WERE shite until that process. Now, coupled with a good bleed and Uberbike pads, they are as good as most stuff-predictable, powerful and definitely have good modulation.
I have ridden motorbikes for years, from crosses to fastroad bikes, still do, and brakes are my first check-if not good, I move on. The speeds and weights we talk about with ebikes cannot even compare to hauling a CRF or R1 to a stop from nearly 3 figure speeds (honest officer, I said nearly).
Horses for courses I suppose, but confidence is a prerequisite for biking,and we all ride/feel different. Just don't get caught up in the ad man's ever expanding blurb net, and ride to the limits of what you can afford and enjoy.