So what are you going to tell these thousands of people?
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Look at how bad this is.
A few (more like many) things about that.
First, that's the rating for all versions, including early versions that lacked more features and people weren't happy about that.
Second, quite a few people are simply not happy about Apple not providing their own YouTube app anymore and simply giving bad ratings based on that (heck, quite a large part don't even realize that it was Apple that used to provide a very dated YouTube app prior to iOS 6, and now it's Google that's producing their own app for their own service).
Third, there are still some features that the app lacks, and people who want this or that often post a bad rating with what they think should be there or shouldn't be there.
Fourth, people like to hate on Google and post bad reviews simply based on that (similar to Facebook and various other large/successful companies).
Fifth, well, there's just many many more reasons, beyond something that implies that YouTube isn't working completely for everyone (or even a large number of people) and/or is just simply horrible in some big way.
Read a ton of the actual reviews to get a better idea of why some of the ratings were given, as simply looking at the rating (let alone one for all versions of an app) doesn't really provide a good representation of it, and certainly doesn't say anything about it working or not working for most people.
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Bottom line is that there really isn't a huge widespread issue when it comes to watching YouTube videos on iOS (6) devices. There are people who might think that's the case, or might want to make it look like that's the case, but that's simply not true.
There are certainly people with individual issues related to YouTube playback, and there are those who want some particular features that might not be there, but that's not exactly that much more drastic than it is pretty much with any other app (in particular those that are more popular and with larger userbases).
That's really all there's to it.