For those who think this is just a problem with the 3D images, or are not convinced there are serious problems even after seeing this tumblr, try looking outside of California, at both satellite and standard maps. Some example searches:
"Brighton, UK", Satellite - a major UK city is so blurry you can't see streets.
"Grand Cayman, Cayman Islands" - ends up in the middle of the sea, and no roads on the islands at all.
"Colchester" - satellite shows clouds, in B&W
"Senkaku Islands" - compare satellite with standard to see duplicates of these disputed islands.
"Puno,Peru"- in lake Titicaca
etc.
They probably had to rush this out, but it's really not ready for widespread use in some areas; they'd have done better to cut back the features and massively extend their testing (or use a crowd-sourced alternative). Given how extensively this is used in iOS, both by apps using Mapkit and by customers every day round the world, it's vital that is it correct, and getting it wrong in such obvious ways is a massive strategic error on Apple's part.