Yeh they say the camera is not quite as good as the competition, but it's very good in lowllight and much better than the camera on the s3..personally I'm more of a snap shooter tHan a photographer and I find it absolutely fine for that purpose.
This...when you're on a night out and require fast and reliable pics then the HTC One M8's camera is superb for just that

As long as you aren't zooming in on Photo's generally then the camera is actually fine, let's just hope that in next years model they bump those Ultapixels up to at least double!!