It's funny, I don't have iOS 5 anymore. I have iOS 6.1.6 on my iPod 4! The heartbleed hack has been patched, It runs fast, and can handle almost every app.
1. iOS 8 can be a glitch fest depending on the device. iPhone 4S iOS 8 anyone?
2. every iOS has horrible battery life in the early versions. Even with iOS 8, after you turn of paralax and, bold everything, it still drains faster than 6.1.6 and even iOS 4!
3. Bloatware is a opinion depending about the user. For example, would you want a iBooks app on your iPhone if you never touch it?` Even the Apple Watch app that you cannot have due to having a 4S?
4. 3rd Party keyboards are compatable with iOS 8. So far, they crash, pop up randomly or, fail to come up at all! I have tested this with a iPad 3 and, the keyboard (regular and 3rd party) still pops up! Try having this happen while playing Clash of Clans!
5. I have seen iOS 8 devices reset and freeze a ton. This also applies to apps fully updates that STILL crash when there iOS 7 and iOS 6 counterparts are bulletproof reliable.
6. How do you know that you do not have wifi Problems. It could be minor or severe. Of course, the severe is more noticible and, 1% of iOS 8 is a Huge number!
7. I made a mistake. Heartbleed is a thing of the past. Wanted to mention Freak which iOS 8.2 still does not patch. Finally, there is always the NSA's back doors
8. iOS 8 has come a long way. Especially 8.2 and 8.1.3. However, there are all the little bugs left like, choppiness, landscape mode lock. With durability of the phone itself, each iPhone is getting more delicate. a 4S does not bend like a 6_ Finally, a iPhone 5 can survive a screen crack while the newer retina displays and finally, Bend-gate (6+ bends)
9.You call this quality. Rumor has it Jony iVes and his Materialism bosos made all off the iOS 7/8 layouts in MICROSOFT WORD! No joke! They changed it because they were power hungry. Not because it would innovate. Heck, they even removed features native to iOS 6 (tweet from notification center)!
http://www.youtube.com/watch?v=RZp7BvQJnU8