The notion that Apple "stole" the do not disturb feature is a feasible one. There are numerous tweaks in Cydia that offer similar or identical functionality, and they have been there before iOS 6 beta 1 was even released. This one is particularly bad considering how Apple files lawsuits on even the broadest of claims (i.e. rectangles with rounded corners), but when they take an idea that someone has already implemented effectively and use it themselves, everyone seems to turn a blind eye. I suppose the spirit of most of the tweaks was to make the iPhone better and not for monetary gain or some sense of "independence", so it's not all that bad.
The fact that Apple has released a major new iOS and didn't fix a major flaw is inherently worrysome, and you should care even if you don't own the device in question. It means they can overlook things. Major things. I've heard reports of devices being unable to connect to Wi-Fi networks through Safari on iOS 6, which is also a very major issue that should have been worked out in the half-a-dozen betas they went through. An issue this major that affects every device only supports the initial point that flaws being overlooked are worth noting for every user, not just specific ones. There are flaws. Some don't affect you. Some do. Care about them, regardless.
Google Maps had numerous features that the new Maps.app is without, like subway and bus routes. I've heard numerous reports of the new maps app also simply being unable to find numerous addresses. Throwing out a tried-and-true method is a thing that Apple has every right to do, but if they try to replace it, and they do a poor job, it should be pointed out. I, personally, have never used Maps.app anyways, so I can't give you any personal stories, but a lot of people around the internet seem pretty unhappy.
Integrated Facebook doesn't sound remotely bad to me, as long as it doesn't get in the way of other features. It probably doesn't.
Privacy infringement is pretty serious, or at least a lot of people seem to think so. If someone doesn't care about their privacy, then there's no sense in trying to sell them on the issue, but for someone to say something like "good for them!" in response to adding operations that hundreds of thousands of users are uncomfortable with is just childish.