Crittercism's have released the first-ever Mobile Experience Benchmark Report: Apple Edition, collecting the iOS performance data from their 1 billion active users. You can view the complete report here, but there's one aspect of the data that will interest anyone who wonders if iOS 8 is really crashing more than iOS 7. You're not crazy, iOS 8 has a 78% higher crash rate than iOS 7.1, but it's not as bad as it sounds.
78% sounds like a lot, but the increase is only from 2% to 3.56%. Obviously the increase in crashes is frustrating, but as the OS is patched this number will continue to get better. The issues most noticeable on older devices, with the iPhone 4 through 5s hitting a 3.57% crash rate for apps. The new iPhone 6 and iPhone 6+ are currently only averaging a 2.63% and 2.11% crash rating respectively.
You can find the rest of Crittercism's report here as a free download.