Just upgraded to iOS 7 and Maps still sucks. There are errors in road names. There are stores shown that closed 7-8 years ago. Stores that do exist are shown a block away from their actual location. In short it is virtually unusable, and it looks wholly amateurish compared to Google's maps. If Apple's maps is meant to be a fallback if Google ever pulled the plug on their map app, then Apple's is failing miserably. If Apple's maps was meant to replace Google's, then Apple's efforts are laughable.
I know what you're thinking: The OP lives in a small town in Scotland, and the focus should be the US first and then metropolitan areas outside the US. Perhaps, but part of Apple's tax minimization scheme is that Apple US uses Apple Ireland to pay for R&D. It seems odd to me that Apple Ireland would be more concerned about the US than Europe. Moreover, I pay more for my iProducts than people in the US do, as I suspect many people in Europe do. Apple has a wad of cash - why is it not spending it on providing services outside the US? Google certainly is....
If Apple can't get better data, then perhaps they had better start collaborating with Google to improve the experience of their customers.
OK lets answer this as a geographic information professional.
Maps and GI is my day job.
Google maps was appalling for several years before it finally became OK. It is still not a patch on Ordnance Survey data (with the exception of streetview), nor will it ever be. If I had the resources I could set up a maps service using freely available OS data that would make G maps as supplied on previous iOS versions look amateurish. Sadly I can't afford servers with enough bandwidth to handle it.
Now the front end app for Apple Maps is actually a well designed mini GIS implementation. It's quick and works. I have issues with Apple's cartography (for example road colours in the UK and the EU are not to standard - Motorways/Autoroutes etc should be blue, Primary routes green etc - but Google have gone the same way!), but Apple in using vector data (with the exception of the aerial mapping which by necessity has to be raster based) they have to be praised. It made Google get off their backside and create their own G Maps app which is reasonable.
The problem is they get their POI and road data from TomTom (or more specifically TeleAtlas). They are IMO the poorest data supplier on the market.
The best in this country is unquestionably OS, but for the MasterMap ITN data (which they would need for TBT directions) the licence fees would be astronomical and as OS is a government agency would probably solve this countries deficit!
The next best supplier is NavTech - They supply most integrated sat nav and the Garmin Nuvi portable sat nav mapping. The problem is they're owned by Nokia, who are now owned by Microsoft... That data is for Windows Phone or for paid apps.
The next best supplier is actually free. It's OpenStreetMap. This is crowd sourced. Everything is under the GPL. It's constantly being updated by users, many of whom (like me) are GI professionals in their day job. If I were Apple I'd be making extensive use of it. (They do make some use of it but not nearly enough IMO).
Then there's Google Maps. It's OK, reasonably accurate but all the above are better.
Lastly TomTom. It's really only designed for TBT navigation You'll find that curves are badly rendered (caused by inaccurate GPS logging), and points of interest are rarely updated.
Then there's issues with the raster data (aerial photography - incorrectly referred to as satellite data) that Apple uses. Some of it is badly mosaicked leading to melting issues, and others are based on old photography - hence some of it is low res and some of the high res is black and white. Google had this problem about 5 years ago.
----------
It was pretty good from the very start actually. At least the map data was accurate.
I beg to differ!
----------
Just because you think it's fine doesn't make it so. Many of us continue to have issues with it and numerous problems I reported a year ago still haven't been fixed.
The Google argument is irrelevant since we were never forced to use it.
You're not forced to use Apple maps either. Google maps is a free download from the app store and now has TBT directions
----------
Yes. I get that. i fail to understand why

don't have cars/people/etc. going around making sure information is correct in Europe. Simply waving their hands and saying 'we got it from poor sources' doesn't really enhance my user experience. But hey, there is always Google Maps. For now. And in the long run if Apple doesn't pull its finger out, there's Google's Android.
Do you have any idea how much it costs for that?
They don't do it in the US either. Google do, yes, but they sell their maps. Anybody that uses google maps APIs for commercial use has to pay. Also Google make money on advertising on their maps. Apple don't.
----------
there are lots of iSheep on the forums, I do love Apple and iOS 7 but lets be honest their maps efforts are a joke
I'd love to see you do better. It's not easy and it's bloody expensive.