In the poll for this thread, more people outside the US thought Apple's maps were poor than excellent. The reverse pattern is true in the US.
I would say that you're slightly manipulating the stats to prove your point.
For people outside the US you get the following results:
27% Excellent
38% OK
34% Poor
For people in the US you get the following results:
54% Excellent
27% OK
19% Poor
Your "steaming pile of excrement" comment (I used poor) does show potentially some bias to how you think the results should be described.
You could just as easily say 65% of people outside of the US think Apple Maps gives an OK or Excellent service compared to 81% of US users. That stat suddenly looks quite good.
My point is that in spite of the fact that Apple has a 'research center' in Ireland, which allows it to avoid corporate tax, the bulk of their money seems to be aimed at providing services to the US. Yet, here in Europe we pay as much or more for our iDevices as those in the US.
That is a massive assumption to make, perhaps Apple being a US company and the US having better mapping partners and up to date information could be part of reason for the discrepancy?
Moreover, I see very little evidence whatsoever that Apple is correcting wildly inaccurate POI's in their database.
I believe Apple are focusing on the areas with the largest population and errors reported first so they can improve the service for the most number of users first. This was what Google did places like Edinburgh and the north of England took years to update (my parents home was a field for about 5 years!). However when I moved to London the errors I did find were updated and fixed a lot quicker.
Here is a population map of the UK, every colour has the same population but as you can see some areas are bigger than others.
http://twitter.com/tkb/status/397428787899420674/photo/1
As you can see fixing issues in London (the small dark blob) would fix issues for a bigger population than all of Scotland, Northern Ireland and the North of England! I am not saying it's great for people in sparsely populated areas but you can see the logic to fixing the issues that effect the most amount of people first?
Apple have obviously partnered with the wrong geoinformation companies, but instead of remedying their error by spending a little more cash, they simply ask us to accept a second-rate service compared to the US.
The statistics (given the size of the ENTIRE WORLD) are not that bad for a relatively new service. As for partnering with the wrong companies I wouldn't say that was necessarily the case, Apple have partnered with TomTom for some of the Map information for example who have a very reliable street map system.
Yes some of the other systems are not quite upto date but if you cannot partner with Google then you have to use other systems like Yelp etc which are not quite as robust. I can't tell how much money they are pouring into mapping but it is definitely hundreds of millions based on mapping companies they have bought however throwing money at a massive problem won't always fix it quicker, you also need time.
There are a lot of unemployed in the UK who no doubt would be ecstatic to correct POI errors for a modest wage. Indeed, does Apple make the process of reporting errors easily documented by allowing photos with GPS information to accompany error reports?
Apple allow GPS based reports built into the Mapping program which should suffice. Correcting POI issues isn't this simple grab a few people off the street and update issues blindly. You need to aggregate all the reports, independently verify that the change is indeed correct (a photo won't be enough proof on it's own). You want corrections to be correct and improve the service, blinding updating things based of anonymous reports is a recipe for problems.
Fo example what if a bunch of students reported a street name error renaming it something rude. If enough people report the "change" it still shouldn't be altered unless independently verified. This cannot be solved quicker by hiring more people in a massive call centre style building.
No, they don't. They're doing a half-assed job. Given the high level of quality in the other domains of Apple products, I find this both frustrating and extremely odd.
Bad

.
I get it, where you live maps is not as good as Google maps. But it took Google over a decade to get the system to the state they have it now after spending billions on it. Expecting Apple to get to the same level in a year or two is expecting a bit much. Given the head start Google have they seem to be doing pretty well based on the poll you ran.
Can they do better? Yes.
Are Apple working pretty hard on improving it? Yes.
Have overall users experiences improved massively since launch of Maps with iOS6? Yes.
Does more focus need to be on the less populated areas now the main areas are getting much better? Yes.
Should we keep reporting issues to Apple to help them keep up the pace? Yes.
Edwin