Could you elaborate a bit on what other vendors screw up?
Here, in Hungary, ordering from Amazon is problematic, because it's such a beast. No human in the loop, and they pass on your package to some delivery vendor anyway, which usually doesn't provide much tracking. So we get no* benefit of the machine at all.
* - sure, we get an interface that's at least consistent and usually available in English
Fast OR cheap shipping. At least in my locality. In the place I most frequently order, free shipping is scheduled for "5-7 business days" to get to me, and frequently gets misdirected and takes an extra day or two (pushing it past another weekend).
When I've ordered to one of Canada's large urban centers it is much faster. But going to an actual store to get something for the same price is also an option, and faster still. And doesn't tend to have difficult to spot counterfeits.
Here, in Hungary, ordering from Amazon is problematic, because it's such a beast. No human in the loop, and they pass on your package to some delivery vendor anyway, which usually doesn't provide much tracking. So we get no* benefit of the machine at all.
* - sure, we get an interface that's at least consistent and usually available in English