Amazon's 'last mile' has definitely gotten better recently. Started showing you a live map when the driver is getting nearby.

What they need to fix is the crazy estimates and deliveries that may turn up from anytime from early morning to "up to 9PM".

Their last mile coverage is quite impressive. I'll get notifications on my phone letting me know my menial package is 9 stops away and to expect it soon. When I open up the alert (usually after it's delivered), I get a picture of the package on my stoop.

It's a way more transparent notification system than I've gotten with the other "Big Three".

Last mile, in general, is shit. Not only Amazon's. That's where most innovation is needed.