1) They can never find our house. Now, We do live in a newer neighborhood (3 yrs old) but USPS, UPS, and FedEx don't have a problem. AMZL US will often miss deliveries because they can't find our house. Usually this just sets the delivery back a day, sometimes 2 or 3. The worst case was 3 weeks.
2) They deliver late. Not really a con; just a fact. if AMZL US is delivering the package it won't get to us before 5.
3) Their drivers are not professionals. I get the feeling anyone can deliver for them. I swear half of the people I see are Uber drivers who don't have a route ATM.
4) Just yesterday AMZL US brought me a package. They guy who brought it didn't know how to scan the package to mark it as delivered. He actually had us do it for him. They have a long way to go before if they want to take this seriously