Don't get me wrong, I love the phone (iPhone 5). But I don't trust it. I travel a lot and maps is something I use very often. Having it integrated with my device makes my life easier. When I click on an address from an email or contact, I want to know the info I get is accurate. Copy and pasting addresses to a 3rd party app is not my idea of fun.
I get it, Apple Maps are certainly lackluster. For me, they aren't a deal breaker.